increased sim speed

AGENTS.linux.md

@@ -1,3 +1,3 @@
 # Linux-specific instructions
 
-- After every iteration, run `dotnet jb cleanupcode --build=False '$file1' '$file2' ...` for every C# file you touched.
+- After every iteration, run `dotnet jb cleanupcode --verbosity:ERROR ./ReactorMaintenance.slnx`.

AGENTS.windows.md

@@ -1,4 +1,4 @@
 # Windows-specific instructions
 
 - After the implementation is finished, run `python D:\Code\crlf.py $file1 $file2 ...` for changed files you recognize, in order to normalize all line endings of all touched files to CRLF.
-- After every iteration, run `jb cleanupcode '$file1' '$file2' ...` for every C# file you touched.
+- After every iteration, run `jb cleanupcode --verbosity:ERROR ReactorMaintenance.slnx`.

TASKS.md

@@ -1,9 +1,84 @@
 # Reactor Maintenance Rewrite Tasks
 
 ## Current State
+- Approved design iteration targets the simulation model, rule removal, action economy, reactor requirements, and editor layer workflow.
+- Work is proceeding on branch `design-iteration-structural-editor` in methodical commits.
+- Completed commits:
+  - `787f1e5` Document approved design iteration.
+  - `3d40617` Restore complete design system documentation.
+  - `e1ac56d` Rework simulation rules.
+- Design documentation must preserve every existing system-level rule unless a change explicitly supersedes it. Superseded sections must document the replacement behavior with equal detail.
+- The next implementation iteration is the Win2D editor overhaul.
 
 ## Completed Work
+- Created the approved implementation plan for:
+  - single multi-service consumers,
+  - count-based reactor requirements,
+  - cell-derived doors,
+  - 0-10 structural integrity,
+  - fixed automatic rule systems,
+  - quick/lengthy action economy,
+  - all-seeing-eye viewing without persistent unlocking,
+  - layer-aware editor visualization and tools.
+- Repaired the design documentation after the hazard-interaction regression:
+  - restored the complete surface hazard interaction matrix,
+  - documented that leaked coolant plus leaked fuel directly holds unless mediated by heat/electricity,
+  - expanded structural integrity, consumer, reactor, all-seeing-eye, and action-economy details.
+- Reworked simulation state and systems:
+  - removed data-driven rule predicates/effects/events from runtime state, validation, forecasts, serialization, and tests,
+  - replaced explicit reactor consumer bindings with unbound reactor controls plus required fuel/coolant/electricity consumer counts,
+  - made consumer props carrier-agnostic with per-carrier service state derived from networks beneath the cell,
+  - moved doors from explicit edge state to door props on floor cells with orientation inferred from opposing wall cells,
+  - added underground structural integrity, high-pressure degradation, automatic leak creation, structural forecasts, and repair-to-max behavior,
+  - removed action budgets and made movement quick while mutating interactions resolve one simulation step,
+  - removed persistent all-seeing-eye unlocking from simulation state,
+  - bumped serialized level schema to version 3.
+- Updated simulation tests for the replacement systems:
+  - consumer derivation and disabled consumer service state,
+  - count-based reactor readiness and reactor-under-network positive-flow requirement,
+  - quick movement versus lengthy door interaction,
+  - inferred door blocking,
+  - structural degradation, automatic leaks, repair integrity reset,
+  - schema version 3 round-tripping and old-schema rejection.
+- Kept the Win2D project compiling after the simulation model changes with narrow compatibility edits. Full editor workflow/rendering work remains outstanding.
+- Verified after the simulation rework:
+  - `dotnet test tests\ReactorMaintenance.Simulation.Tests\ReactorMaintenance.Simulation.Tests.csproj` passed with 23 tests,
+  - `dotnet build ReactorMaintenance.slnx` passed with 0 warnings.
+- Reworked the Win2D editor workflow:
+  - added the Surface/Electricity/Fuel/Coolant layer combobox,
+  - filtered tools by active layer and fixed exclusive tool selection,
+  - rendered underground networks as carrier-colored centerline networks with source dots and layer opacity rules,
+  - removed Rule Events, Reactor Binding, and pending workflow panels from the editor UI,
+  - replaced two-click electricity leak authoring with electric-layer leak access cycling,
+  - made Shift+left drag pan in all tools and Cursor drag move the robot or props.
+- Added editor-helper tests for electricity leak access cycling and cursor drag movement behavior.
+- Verified after the editor overhaul:
+  - `dotnet test tests\ReactorMaintenance.Simulation.Tests\ReactorMaintenance.Simulation.Tests.csproj` passed with 26 tests,
+  - `dotnet build ReactorMaintenance.slnx` passed with 0 warnings.
 
 ## Current Work
+- Editor overhaul implementation is complete; commit is pending.
+
+## Editor Overhaul Requirements
+- Add a layer combobox with Surface, Electricity, Fuel, and Coolant.
+- When Surface is active, draw the surface layer at full opacity and all underground layers at 25% opacity.
+- When an underground layer is active, draw the surface layer at 50% opacity, other underground layers at 25% opacity, and the active underground layer at full opacity.
+- Render coolant blue, fuel red, and electricity yellow.
+- Render networks as thick lines connecting adjacent cell centers; render sources as large centered dots.
+- Make tools layer-aware:
+  - Cursor is always available.
+  - Heat, Floor, Walls, Props, Consumers, Hazards, and Doors are only available for Surface.
+  - Network painting and Sources are only available on their respective underground layers.
+- Selecting a tool must deselect all other tools. The current two-way binding can leave multiple tools selected.
+- Shift+LMB should pan the view in all tools, including Cursor mode.
+- Cursor LMB drag should move any prop or robot from one cell to another.
+- Remove Rule Events UI.
+- Remove Reactor Binding UI.
+- Remove editor workflow and pending actions.
+- Door cells are redesigned as single prop cells.
+- Electricity leak neighbour should be toggled by using the electric leak tool on an existing electric leak cell.
 
 ## Future Work
+- Add authored sample levels once the new schema stabilizes.
+- Tune structural integrity balancing after playtesting.
+- Extend UI affordances for inspecting per-carrier consumer service state.

docs/design.md

@@ -4,44 +4,57 @@
 
 The player controls a maintenance robot inside a failing reactor facility. The game is a deterministic, turn-based systems puzzle about reading a visible machine, forecasting failure, and choosing between local stabilization and longer-term network control.
 
-The simulation uses a small formal core:
+The simulation core is built from:
 
-- static floor and wall terrain
-- underground fuel, coolant, and electricity networks
-- surface props for controls, terminals, supplies, doors, and reactor activation
-- reachable leaks that project hazards onto floor cells
-- explicit reactor requirements bound to consumer props
-- deterministic rule events and forecasts
+- static floor and wall terrain,
+- underground fuel, coolant, and electricity networks,
+- surface props for controls, terminals, supplies, doors, and reactor activation,
+- consumers that consume whichever underground services exist under their cell,
+- reachable leaks that project hazards onto floor cells,
+- transport network structural integrity,
+- deterministic fixed simulation rules and forecasts.
 
-The game should feel logical, tactical, readable, and systemic. It should avoid randomness, action pressure, and hidden information after the player earns the relevant diagnostic access.
+The game should feel logical, tactical, readable, and systemic. It should avoid randomness, action pressure, and hidden information once the player reaches an all-seeing-eye terminal.
 
-## Turn Structure
+## Action Economy
 
-Each turn has three phases:
+There is no per-turn action budget. Player choices are either quick or lengthy.
 
-1. Player phase: the player spends the level action budget.
-2. Simulation phase: networks, consumers, leaks, hazards, doors, robot safety, and level state resolve.
-3. Event phase: rule events, remedy block durations, and heat immunity duration advance.
+Quick actions do not mutate the level state and do not advance the simulation:
 
-The simulation advances once after the player spends or ends the turn action budget. Individual player actions do not tick the simulation.
+- `MoveRobot`: move the robot to an adjacent floor cell, reduce heat immunity movement steps if applicable, and reject movement into walls or out of bounds,
+- selection and inspection: change only UI selection state,
+- all-seeing-eye viewing: when the robot is at an all-seeing-eye terminal, allow the player to view every surface and underground layer.
+
+Lengthy actions mutate level state and immediately advance one simulation step:
+
+- `InteractProp`: toggle flow props, toggle consumers, cycle junction ratios, open or close doors, pick up remedy supplies, or activate all-seeing-eye viewing from a terminal,
+- `InteractLeak`: repair a reachable leak or apply a matching elemental remedy,
+- `ApplyHeatShield`: spend one heat shield and set heat immunity movement steps,
+- `ActivateReactor`: activate a ready reactor at the current reactor control prop,
+- `Wait`: advance one simulation step without applying another player mutation.
+
+Invalid actions report refusal and do not mutate gameplay state.
 
 ## Goal And Failure
 
 Each reactor starts offline. A reactor becomes ready when:
 
-- its bound fuel consumer is enabled, supplied, and producing
-- its bound coolant consumer is enabled, supplied, and producing
-- its bound electricity consumer is enabled, supplied, and producing
-- reactor heat is below the terminal condition
+- every underground network present beneath the reactor control cell has positive amount and intensity,
+- the level has the required number of enabled, fed, producing fuel consumers,
+- the level has the required number of enabled, fed, producing coolant consumers,
+- the level has the required number of enabled, fed, producing electricity consumers,
+- reactor heat is below the terminal condition.
 
-When a reactor is ready, the level shows `REACTOR READY`. The player wins by spending an action at that reactor control site.
+The required consumer counts are level properties. The reactor is not explicitly bound to any consumer positions.
+
+When a reactor is ready, the level shows `REACTOR READY`. The player wins by activating the ready reactor at the reactor control site.
 
 The level is lost when:
 
-- reactor heat reaches the terminal threshold
-- the robot occupies an unsafe final hazard state without applicable protection
-- a rule event marks terminal failure
-- level-authored unrecoverable conditions are met
+- reactor heat reaches the terminal threshold,
+- the robot occupies an unsafe final hazard state without applicable protection,
+- fixed simulation rules mark terminal failure.
 
 Consumer starvation blocks readiness but does not directly cause loss.
 
@@ -49,17 +62,17 @@ Consumer starvation blocks readiness but does not directly cause loss.
 
 The player can always inspect:
 
-- surface terrain
-- surface props and visible prop state
-- visible leaks and repair faces
-- visible surface hazards
-- door state
-- remedy inventory and supply props
-- consumer state: disabled, starved, supplied, producing, or unknown
-- level state
-- forecasted warnings the simulation can prove
+- surface terrain,
+- surface props and visible prop state,
+- visible leaks and repair faces,
+- visible surface hazards,
+- door state,
+- remedy inventory and supply props,
+- consumer state: disabled, starved, supplied, producing, or unknown,
+- level state,
+- forecasted warnings the simulation can prove.
 
-Underground topology and numeric network values are hidden until all-seeing-eye terminal access is unlocked. With access, the player can inspect underground fuel, coolant, and electricity topology, network structural state, carrier amount, pressure or voltage, and source-to-consumer connectivity.
+Underground topology and numeric network values are available through all-seeing-eye viewing after the robot visits an all-seeing-eye terminal. There is no persistent lock or unlock state in the level data.
 
 The editor always sees and authors every layer.
 
@@ -69,31 +82,41 @@ Safe, caution, and critical labels are display and forecast bands derived from b
 
 Each map coordinate contains:
 
-- one static surface terrain cell: `Floor` or `Wall`
-- zero or one underground fuel cell
-- zero or one underground coolant cell
-- zero or one underground electricity cell
-- zero or one surface prop
-- visible hazard amounts on floor cells
-- optionally the robot, only on a floor cell
+- one static surface terrain cell: `Floor` or `Wall`,
+- zero or one underground fuel cell,
+- zero or one underground coolant cell,
+- zero or one underground electricity cell,
+- zero or one surface prop,
+- visible hazard amounts on floor cells,
+- optionally the robot, only on a floor cell.
 
 Terrain is authored and does not change during play. Wall cells are not walkable and do not store surface hazards.
 
 Underground cells use one structural state:
 
-- `Absent`
-- `Intact`
-- `Leaking`
+- `Absent`,
+- `Intact`,
+- `Leaking`.
 
-Underground cells store carrier amount plus pressure for fuel/coolant or voltage for electricity. Same-carrier underground cells connect by inferred cardinal adjacency.
+Underground cells store carrier amount, pressure or voltage intensity, and structural integrity on a 0-10 scale. Max structural integrity supports the highest pressure. Non-max integrity under high pressure worsens proportionally to excess pressure. Low integrity with positive pressure creates a leak. Repairing a leak restores integrity to max.
+
+Structural integrity is persistent authored and runtime state:
+
+- absent cells have no meaningful structural integrity,
+- newly authored present cells start at max structural integrity,
+- network propagation updates amount and intensity but does not reset integrity,
+- structural integrity cannot exceed max and cannot fall below zero,
+- existing leaks keep their current integrity until repaired.
+
+Same-carrier underground cells connect by inferred cardinal adjacency.
 
 Surface floor cells store:
 
-- leaked fuel
-- leaked coolant
-- leaked electricity
-- heat
-- active elemental remedy blocks
+- leaked fuel,
+- leaked coolant,
+- leaked electricity,
+- heat,
+- active elemental remedy blocks.
 
 Simulation values use C# `float`. Runtime values are clamped and retain full float precision. UI shows visible values rounded to one decimal plus the safe/caution/critical band.
 
@@ -112,13 +135,13 @@ The derived level states are:
 
 Surface prop categories:
 
-- flow prop
-- consumer prop
-- junction prop
-- door prop
-- all-seeing-eye terminal prop
-- remedy supply prop
-- reactor control prop
+- flow prop,
+- consumer prop,
+- junction prop,
+- door prop,
+- all-seeing-eye terminal prop,
+- remedy supply prop,
+- reactor control prop.
 
 Props exist on floor cells. Props do not directly participate in the surface hazard pair table.
 
@@ -130,25 +153,29 @@ During network flow, an enabled flow prop injects source carrier amount and pres
 
 ### Consumer Props
 
-A consumer prop is bound to fuel, coolant, or electricity. It can be `Enabled` or `Disabled`.
+A consumer prop can be `Enabled` or `Disabled`.
 
-An enabled consumer derives one service state after network propagation:
+An enabled consumer derives one service state per underground network present beneath it:
 
-- `Supplied`: enough carrier and pressure or voltage reaches the bound underground cell.
+- `Supplied`: enough carrier and pressure or voltage reaches the underground cell.
 - `Starved`: supply predicates fail.
 - `Producing`: the consumer was supplied this simulation step and emits service.
 
-A disabled consumer consumes nothing, produces nothing, and cannot satisfy reactor readiness.
+A disabled consumer consumes nothing, produces nothing, and cannot satisfy reactor readiness. A consumer on no underground layer is valid but produces no service and contributes no readiness requirement. A consumer on one underground layer consumes that service. A consumer on multiple underground layers consumes all present layers and can satisfy one requirement for each carrier that is producing.
+
+The aggregate consumer prop still exposes a single switch state. Per-carrier service state is derived from the underground layers beneath the prop and is used by reactor readiness, forecasts, and inspection. If any consumed carrier is starved, the consumer contributes a warning for that carrier without blocking other carriers on the same prop from producing.
 
 ### Reactor Control Props
 
-A reactor control prop is the activation site for one reactor. Each reactor stores required consumer bindings by grid position:
+A reactor control prop is the activation site for one reactor. Reactor readiness is derived from level-level consumer count requirements and the networks beneath the reactor control cell.
 
-- fuel consumer position
-- coolant consumer position
-- electricity consumer position
+The reactor control prop itself is not bound to any individual consumer. It is considered a local consumer for any underground network present beneath its cell:
 
-The level is invalid if any binding is missing, out of bounds, or points to the wrong prop type.
+- if no underground layer is present beneath the reactor, the local reactor feed requirement is satisfied,
+- if one or more underground layers are present, every present layer must have positive amount and positive intensity after network propagation,
+- a present but starved reactor-under-network blocks readiness but does not directly lose the level.
+
+Level properties define `RequiredFuelConsumers`, `RequiredCoolantConsumers`, and `RequiredElectricityConsumers`. For each carrier, readiness requires at least that many enabled consumer props whose per-carrier service state is `Producing`.
 
 ### Junction Props
 
@@ -156,25 +183,32 @@ A junction prop must be on a floor cell whose coordinate has exactly one undergr
 
 The engine infers incoming and outgoing branch directions from valid network topology and enabled source paths. A valid junction has one incoming branch and either two or three outgoing branches. Ambiguous junction flow is invalid. Ratio numbers are balance-defined weights that divide carrier amount and pressure or voltage. A zero-weight branch receives no intentional outflow.
 
-The gameplay UI exposes a single junction tool and cycles through balance-defined ratio presets for the inferred outgoing branch count.
-Editor commands use a verb plus parameters, so carrier-specific choices such as fuel flow or coolant flow are UI presets over one `Flow` command instead of separate simulation concepts.
-
 ### Doors
 
-A door stores one edge between two adjacent floor cells. Door states are `Open` and `Closed`.
+A door is a prop on one floor cell. Its orientation is derived from opposing wall cells:
 
-Closed doors block fuel, coolant, electricity, and heat propagation across their edge. They do not block robot movement, underground network flow, source feeding, consumer supply, or hazards already present on either side.
+- north and south walls mean the door sits in an east-west corridor and blocks west/east propagation while closed,
+- west and east walls mean the door sits in a north-south corridor and blocks north/south propagation while closed.
+
+A door must have exactly one valid opposing wall pair. Closed doors block fuel, coolant, electricity, and heat propagation across the corridor cell. They do not block robot movement, underground network flow, source feeding, consumer supply, or hazards already present on either side.
+
+Door blocking is evaluated by the door cell and its inferred corridor axis:
+
+- east-west corridor doors block surface interaction between the west neighbor, the door cell, and the east neighbor while closed,
+- north-south corridor doors block surface interaction between the north neighbor, the door cell, and the south neighbor while closed,
+- open doors do not block surface interaction,
+- door props on invalid terrain or with ambiguous opposing walls are validation errors.
 
 ### Terminals And Supplies
 
-An all-seeing-eye terminal unlocks underground inspection for the level.
+An all-seeing-eye terminal allows full underground inspection when visited.
 
 Remedy supply props are single-use pickups:
 
-- `FuelRemedySupply`
-- `CoolantRemedySupply`
-- `ElectricityRemedySupply`
-- `HeatRemedySupply`
+- `FuelRemedySupply`,
+- `CoolantRemedySupply`,
+- `ElectricityRemedySupply`,
+- `HeatRemedySupply`.
 
 Each supply provides one matching inventory item and then becomes depleted.
 
@@ -184,45 +218,30 @@ Each leak stores carrier type, underground coordinate, accessible floor coordina
 
 Fuel and coolant leaks:
 
-- occur under floor cells
-- use the same coordinate as their accessible floor coordinate
-- can be repaired or remediated by the robot standing on that floor cell
+- occur under floor cells,
+- use the same coordinate as their accessible floor coordinate,
+- can be repaired or remediated by the robot standing on that floor cell.
 
 Electricity leaks:
 
-- occur in wall cells
-- store exactly one adjacent floor cell as the emission face
-- can be repaired or remediated from that floor cell
-- emit only to that stored face
+- occur in wall cells,
+- store exactly one adjacent floor cell as the emission face,
+- can be repaired or remediated from that floor cell,
+- emit only to that stored face.
 
-All leaks must have valid floor access. Repair changes the underground cell from `Leaking` to `Intact` and stops future injection. Repair does not clean existing surface hazards.
+All leaks must have valid floor access. Repair changes the underground cell from `Leaking` to `Intact`, restores structural integrity to max, and stops future injection. Repair does not clean existing surface hazards.
 
 The robot carries remedial consumables with balance-defined inventory capacity:
 
-- `FuelNeutralizer`
-- `CoolantNeutralizer`
-- `ElectricityNeutralizer`
-- `HeatShield`
+- `FuelNeutralizer`,
+- `CoolantNeutralizer`,
+- `ElectricityNeutralizer`,
+- `HeatShield`.
 
 Element neutralizers remove the matching surface element from a target floor cell or reachable leak face, then apply a temporary same-element re-entry block. They do not remove other elements, reduce heat, or repair leaks.
 
 Heat shield gives the robot heat immunity for a balance-defined number of movement steps. It does not remove heat, block heat propagation, or protect against fuel, coolant, or electricity hazards.
 
-## Player Actions
-
-Player actions:
-
-- `MoveRobot`: move to an adjacent floor cell.
-- `InteractProp`: use the prop on the robot's current floor cell.
-- `InteractLeak`: repair a reachable leak or apply a matching elemental remedy.
-- `ApplyHeatShield`: activate a carried heat shield.
-- `ActivateReactor`: activate a ready reactor at the current reactor control prop.
-- `EndTurn`: forfeit remaining actions and run the simulation/event phases.
-
-Each valid action costs one action unless balance or level data defines otherwise. Invalid actions report refusal and do not mutate gameplay state.
-
-`InteractProp` covers flow toggles, consumer toggles, junction ratio changes, door toggles, terminal unlock, and remedy pickup.
-
 ## Network Flow
 
 Network flow runs independently for fuel, coolant, and electricity.
@@ -248,34 +267,40 @@ Leaking underground cells remain part of network propagation.
 
 During leak injection:
 
-- fuel leaks add leaked fuel to the accessible floor cell
-- coolant leaks add leaked coolant to the accessible floor cell
-- electricity leaks add leaked electricity to the stored floor emission face
-- active matching remedy blocks prevent matching element entry
+- fuel leaks add leaked fuel to the accessible floor cell,
+- coolant leaks add leaked coolant to the accessible floor cell,
+- electricity leaks add leaked electricity to the stored floor emission face,
+- active matching remedy blocks prevent matching element entry.
 
-Injection magnitude is balance data and may depend on local carrier amount, pressure, or voltage.
+Injection magnitude is balance data and may depend on local carrier amount, pressure, or voltage. If the target floor cell has an active matching remedy block, that matching element is not injected into the cell for that step. Remedy blocks do not block other elements or heat.
 
 After injection, the engine evaluates local interactions between leaked fuel, leaked coolant, leaked electricity, and heat on the same floor cell and across unblocked adjacent floor cells.
 
+Surface interaction resolution is deterministic:
+
+- same-cell interactions evaluate every unordered quantity pair on each floor cell,
+- adjacent interactions evaluate every unordered pair of adjacent floor cells once,
+- same-carrier leaked fuel, coolant, electricity, and heat equalize across adjacent floor cells using `Flow(amount)`,
+- wall cells never store surface hazards and do not participate,
+- closed doors and remedy blocks gate the interactions they explicitly block,
+- deltas accumulate during an interaction pass and are applied together before clamping.
+
 ## Hazard Bands And Pair Table
 
 Balance thresholds project numeric values into safe, caution, and critical bands:
 
-- `FuelSafe`, `FuelCaution`, `FuelCritical`
-- `CoolantSafe`, `CoolantCaution`, `CoolantCritical`
-- `ElectricitySafe`, `ElectricityCaution`, `ElectricityCritical`
-- `HeatSafe`, `HeatCaution`, `HeatCritical`
+- `FuelSafe`, `FuelCaution`, `FuelCritical`,
+- `CoolantSafe`, `CoolantCaution`, `CoolantCritical`,
+- `ElectricitySafe`, `ElectricityCaution`, `ElectricityCritical`,
+- `HeatSafe`, `HeatCaution`, `HeatCritical`.
 
-The pair table maps projected bands to deterministic effects:
-
-- `Hold`: no direct change.
 The pair table maps projected bands to parameterized verbs:
 
-- `Hold`: no direct change.
-- `Flow(amount)`: equalize a surface quantity by a balance-defined transfer amount.
-- `Warm(amount)`: increase heat by a balance-defined amount.
-- `Quench(amount)`: reduce heat by a balance-defined amount.
-- `Short(heat, discharge)`: add heat and discharge electricity by balance-defined amounts.
+- `Hold`: no direct change,
+- `Flow(amount)`: equalize a surface quantity by a balance-defined transfer amount,
+- `Warm(amount)`: increase heat by a balance-defined amount,
+- `Quench(amount)`: reduce heat by a balance-defined amount,
+- `Short(heat, discharge)`: add heat and discharge electricity by balance-defined amounts,
 - `Ignite(heat, fuel)`: add heat and consume fuel by balance-defined amounts.
 
 | Row\Col | FuelSafe | FuelCaution | FuelCritical | CoolantSafe | CoolantCaution | CoolantCritical | ElectricitySafe | ElectricityCaution | ElectricityCritical | HeatSafe | HeatCaution | HeatCritical |
@@ -293,64 +318,76 @@ The pair table maps projected bands to parameterized verbs:
 | HeatCaution |  |  |  |  |  |  |  |  |  |  | Hold | Flow |
 | HeatCritical |  |  |  |  |  |  |  |  |  |  |  | Hold |
 
+Blank lower-triangle entries mirror the corresponding upper-triangle entry. Fuel and coolant do not directly react with each other; leaked coolant plus leaked fuel is `Hold` unless another pair on that cell or an adjacent cell involves heat, electricity, or same-carrier flow.
+
 Design rules:
 
-- fuel becomes dangerous through electricity or heat
-- coolant becomes dangerous through electricity
-- coolant opposes heat
-- heat equalizes between neighboring floor cells
-- same-carrier leaked surface amounts equalize between neighboring floor cells
-- doors and remedy blocks gate local interactions
+- fuel becomes dangerous through electricity or heat,
+- coolant becomes dangerous through electricity,
+- coolant opposes heat,
+- heat equalizes between neighboring floor cells,
+- same-carrier leaked surface amounts equalize between neighboring floor cells,
+- doors and remedy blocks gate local interactions.
 
-## Rule Events
+## Structural Integrity
 
-Rule events are deterministic and forecastable. Each event stores enabled state, once/repeat behavior, priority, predicates, effects, and optional forecast text. All predicates must pass for the event to trigger.
+Structural integrity is resolved after network propagation and before leak injection. It is deterministic and uses balancing values:
 
-Predicate families:
+- `MaxStructuralIntegrity`: the maximum integrity value, `10` for the approved scale,
+- `StructuralIntegrityHighIntensityThreshold`: the pressure or voltage threshold above which a weakened cell degrades,
+- `StructuralIntegrityDamageScale`: difficulty-specific multiplier, initially `0.25` in Normal difficulty,
+- `StructuralIntegrityLeakThreshold`: integrity at or below this value can become a leak when positive intensity exists.
 
-- turn comparisons
-- level state comparisons
-- reactor readiness/loss/win comparisons
-- prop type or state at position
-- consumer service state at position
-- network value band at position
-- surface hazard band at position
-- robot position or inventory condition
-- all-seeing-eye unlocked state
+For every present underground cell:
 
-Effects:
+1. If the cell is already max integrity, high intensity does not weaken it during that step.
+2. If integrity is below max and intensity is greater than the high threshold, integrity is reduced by `(intensity - threshold) * StructuralIntegrityDamageScale`.
+3. Integrity is clamped to the 0-10 range.
+4. If the final integrity is at or below the leak threshold and intensity is positive, the cell becomes `Leaking` and a `LeakState` is created if one does not already exist.
 
-- start a valid leak
-- worsen an existing leak
-- repair or disable a network cell
-- enable or disable a prop
-- add or remove surface hazard
-- add or remove heat
-- add or remove inventory
-- mark terminal loss
-- emit warning text
+Automatic leak access follows the same rules as authored leaks:
+
+- fuel and coolant leaks use the underground cell as their floor access and can only auto-start under floor cells,
+- electricity leaks require one adjacent floor access face; if multiple valid faces exist, the deterministic order is north, east, south, west,
+- if no valid floor access exists, the weakened cell remains damaged but no reachable leak state is created.
+
+Repairing a leak sets the underground cell to `Intact`, sets structural integrity to max, marks the leak repaired, and leaves existing surface hazards unchanged.
+
+## Fixed Rule Systems
+
+Data-driven rule predicates and effects are not part of level data. Effects happen through fixed systems:
+
+- player-issued lengthy interactions toggle props, cycle junctions, use inventory, open or close doors, repair leaks, and activate reactors,
+- network propagation clears transient amount and intensity, then recomputes flow from enabled sources,
+- consumer resolution derives per-carrier service states from present underground layers,
+- structural integrity resolution weakens damaged high-pressure cells and creates leaks from low-integrity positive-pressure cells,
+- leak injection adds carrier hazards to valid floor access cells,
+- surface interaction resolution spreads and reacts hazards according to the hazard pair table,
+- robot safety resolves terminal loss from unsafe final hazard states after surface interactions,
+- reactor state derives readiness or terminal heat loss,
+- duration advancement reduces remedy blocks and heat immunity counters,
+- forecast refresh simulates copied state over the configured horizon.
+
+Warnings are generated by fixed forecast and status systems when conditions can be proven.
 
 ## Simulation Order
 
-One completed turn resolves in this order:
+One lengthy interaction resolves in this order:
 
-1. Apply accepted player actions.
+1. Apply the accepted player mutation.
 2. Validate runtime state.
-3. Apply matching start-of-simulation rule events.
-4. Propagate underground networks.
-5. Resolve consumers and service production.
+3. Propagate underground networks.
+4. Resolve consumers and service production.
+5. Resolve structural integrity and automatic leak creation.
 6. Inject leaks.
 7. Evaluate same-cell surface interactions.
-8. Evaluate adjacent floor interactions across unblocked edges.
+8. Evaluate adjacent floor interactions across unblocked door cells.
 9. Accumulate and apply deltas in deterministic priority order.
 10. Clamp values.
 11. Resolve robot safety.
 12. Derive reactor readiness and level state.
-13. Apply matching end-of-turn rule events.
-14. Advance remedy blocks and heat immunity.
-15. Refresh forecasts.
-
-If multiple events modify the same value in one step, deltas accumulate and then clamp. Event priority may consume, reserve, or block a value first.
+13. Advance remedy blocks and heat immunity.
+14. Refresh forecasts.
 
 ## Forecasts
 
@@ -358,11 +395,11 @@ Forecasts are deterministic simulations over copied state. Forecasting does not
 
 Forecast output includes:
 
-- terminal loss forecasts
-- reactor ready forecasts
-- starved required consumer warnings
-- growing hazard warnings when values cross caution or critical bands
-- rule event warnings when predicates can be proven within the forecast horizon
+- terminal loss forecasts,
+- reactor ready forecasts,
+- starved required consumer warnings,
+- growing hazard warnings when values cross caution or critical bands,
+- structural integrity leak warnings when weakened cells are expected to leak.
 
 The forecast horizon is balance data.
 
@@ -372,51 +409,60 @@ The editor blocks run and save when validation errors exist. Warnings are visibl
 
 Validation errors:
 
-- invalid dimensions or cell counts
-- robot out of bounds or not on floor
-- wall cell with surface hazards
-- prop on invalid terrain
-- missing or invalid reactor consumer binding
-- invalid door edge
-- invalid leak access
-- invalid rule target
-- junction without exactly one underground carrier
-- ambiguous junction flow
-- network loop or equal-source ambiguity at a junction
-- malformed required data
+- invalid dimensions or cell counts,
+- robot out of bounds or not on floor,
+- wall cell with surface hazards,
+- prop on invalid terrain,
+- invalid required consumer counts,
+- invalid door cell,
+- invalid leak access,
+- junction without exactly one underground carrier,
+- ambiguous junction flow,
+- network loop or equal-source ambiguity at a junction,
+- malformed required data.
 
 Validation warnings:
 
-- unreachable non-required consumer
-- underground cell with no source path
-- initially starved required consumer
-- initially unready reactor
-- unused remedy supply
-- visible hazard with no detectable nearby remedy or route
+- unreachable non-required consumer,
+- underground cell with no source path,
+- initially starved required consumer,
+- initially unready reactor,
+- unused remedy supply,
+- visible hazard with no detectable nearby remedy or route.
 
 ## Editor And Schema
 
 The editor authors:
 
-- surface terrain
-- underground fuel, coolant, and electricity cells
-- flow props and consumer props
-- reactor controls and explicit reactor consumer bindings
-- junction props and balance-defined ratio mode index
-- door props and explicit door edges
-- all-seeing-eye terminals
-- remedy supplies
-- floor leaks and electricity wall leaks with authored access faces
-- initial surface hazards and heat
-- robot start position
-- rule events
+- surface terrain,
+- underground fuel, coolant, and electricity cells,
+- flow props,
+- multi-service consumer props,
+- required fuel, coolant, and electricity consumer counts,
+- junction props and balance-defined ratio mode index,
+- door props,
+- all-seeing-eye terminals,
+- remedy supplies,
+- floor leaks and electricity wall leaks with authored access faces,
+- initial surface hazards and heat,
+- robot start position.
 
-The serialized level schema stores level metadata, dimensions, terrain, underground layers, props and prop state, reactor bindings, leaks, doors, robot state, inventory, rule events, all-seeing-eye state, and dynamic state when saving active play.
+The editor includes layer selection for Surface, Electricity, Fuel, and Coolant:
+
+- Surface active: surface is full opacity, all underground layers are 25% opacity.
+- Underground active: surface is 50% opacity, inactive underground layers are 25% opacity, active underground layer is full opacity.
+- Coolant renders blue, fuel red, electricity yellow.
+- Networks render as thick lines connecting adjacent cell centers; sources render as large centered dots.
+- Tools are layer-aware. Cursor is always available. Surface terrain, props, consumers, hazards, doors, and heat tools are available only on Surface. Network painting and sources are available only on their matching underground layer.
+
+Editor tool badges and drag previews use stable semantic image keys when assets are available. Assets may be added under `Images/Badges` or `Images/Elements` with filenames such as `tool-door.png`, `prop-reactor.png`, `carrier-fuel-source.png`, `leak-electricity.png`, or `robot.png`; missing assets fall back to compact procedural badges and text labels.
+
+The serialized level schema stores level metadata, dimensions, terrain, underground layers including structural integrity, props and prop state, required reactor consumer counts, leaks, robot state, inventory, forecasts, and dynamic state when saving active play.
 
 The loader accepts only schema-valid level data and returns clear errors for malformed data.
 
 ## Balancing And Tests
 
-Balancing defines source strengths, falloff, ratio math, consumer predicates, leak magnitudes, interaction magnitudes, display thresholds, robot safety thresholds, terminal heat thresholds, inventory capacity, remedy duration, heat immunity duration, action costs, and forecast horizon.
+Balancing defines source strengths, falloff, ratio math, consumer predicates, leak magnitudes, structural integrity thresholds and damage scale, interaction magnitudes, display thresholds, robot safety thresholds, terminal heat thresholds, inventory capacity, remedy duration, heat immunity duration, and forecast horizon.
 
-Tests assert behavior against configured balance values and bands. Coverage includes validation, inferred connectivity, junction effects, consumer states, reactor readiness and activation, terminal loss, robot hazard loss, heat immunity, leak access, remedies, door blocking, rule events, forecasts, and serialization round trips.
+Tests assert behavior against configured balance values and bands. Coverage includes validation, inferred connectivity, junction effects, multi-service consumer states, reactor readiness and activation, terminal loss, robot hazard loss, heat immunity, structural integrity degradation and leak creation, leak access, remedies, door blocking, forecasts, and serialization round trips.

src/ReactorMaintenance.Simulation/Balancing.cs

@@ -60,6 +60,16 @@ public abstract class Balancing
         return new() { Verb = ESurfaceInteractionVerb.Flow, Quantity = quantity, Amount = FlowTransferRatio };
     }
 
+    public float StructuralPressureThreshold(ECarrierType carrier)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => FuelCritical,
+            ECarrierType.Coolant => CoolantCritical,
+            ECarrierType.Electricity => ElectricityCritical,
+            _ => MaxValue
+        };
+    }
+
     private SurfaceInteractionEffect Warm(EBand rowBand, EBand colBand)
     {
         return new() {
@@ -110,7 +120,6 @@ public abstract class Balancing
     public abstract int DefaultLevelWidth { get; }
     public abstract int DefaultLevelHeight { get; }
     public abstract int MinimumLevelSize { get; }
-    public abstract int ActionsPerTurn { get; }
     public abstract int ForecastHorizon { get; }
     public abstract float MinValue { get; }
     public abstract float MaxValue { get; }
@@ -139,6 +148,9 @@ public abstract class Balancing
     public abstract IReadOnlyList<JunctionRatioPreset> ThreeOutflowJunctionRatios { get; }
     public abstract float ConsumerRequiredAmount { get; }
     public abstract float ConsumerRequiredIntensity { get; }
+    public abstract int MaxStructuralIntegrity { get; }
+    public abstract int StructuralIntegrityLeakThreshold { get; }
+    public abstract float StructuralIntegrityDamageScale { get; }
     public abstract float LeakBaseAmount { get; }
     public abstract float LeakAmountScale { get; }
     public abstract float LeakIntensityScale { get; }

src/ReactorMaintenance.Simulation/Difficulties/NormalBalancing.cs

@@ -5,7 +5,6 @@ public class NormalBalancing : Balancing
     public override int DefaultLevelWidth => 16;
     public override int DefaultLevelHeight => 12;
     public override int MinimumLevelSize => 4;
-    public override int ActionsPerTurn => 3;
     public override int ForecastHorizon => 6;
     public override float MinValue => 0;
     public override float MaxValue => 10;
@@ -48,6 +47,9 @@ public class NormalBalancing : Balancing
 
     public override float ConsumerRequiredAmount => 2.5f;
     public override float ConsumerRequiredIntensity => 2.5f;
+    public override int MaxStructuralIntegrity => 10;
+    public override int StructuralIntegrityLeakThreshold => 2;
+    public override float StructuralIntegrityDamageScale => 0.35f;
     public override float LeakBaseAmount => 0.5f;
     public override float LeakAmountScale => 0.15f;
     public override float LeakIntensityScale => 0.1f;

src/ReactorMaintenance.Simulation/LevelEditor.cs

@@ -2,6 +2,132 @@
 
 public static class LevelEditor
 {
+    public sealed record MoveOccupantResult(bool Success, LevelState Level, string Reason)
+    {
+        public static MoveOccupantResult Succeeded(LevelState level)
+        {
+            return new(true, level, string.Empty);
+        }
+
+        public static MoveOccupantResult Failed(LevelState level, string reason)
+        {
+            return new(false, level, reason);
+        }
+    }
+
+    public static LevelState MoveOccupant(LevelState level, GridPosition source, GridPosition destination)
+    {
+        return TryMoveOccupant(level, source, destination).Level;
+    }
+
+    public static MoveOccupantResult TryMoveOccupant(LevelState level, GridPosition source, GridPosition destination)
+    {
+        if (!level.InBounds(source))
+            return MoveOccupantResult.Failed(level, "Drag start is outside the level.");
+
+        if (!level.InBounds(destination))
+            return MoveOccupantResult.Failed(level, "Drop target is outside the level.");
+
+        if (source == destination)
+            return MoveOccupantResult.Failed(level, "Drop target is the same cell.");
+
+        var prop = level.GetProp(source);
+        if (prop.Type != EPropType.None)
+            return TryMoveProp(level, source, destination, prop);
+
+        var leak = level.Leaks.FirstOrDefault(leak => !leak.Repaired && (leak.AccessPosition == source || leak.UndergroundPosition == source));
+        if (leak is not null)
+            return TryMoveLeak(level, leak, destination);
+
+        return level.Robot.Position == source
+            ? TryMoveRobot(level, destination)
+            : MoveOccupantResult.Failed(level, "No movable robot, prop, source, or leak starts here.");
+    }
+
+    private static MoveOccupantResult TryMoveRobot(LevelState level, GridPosition destination)
+    {
+        if (!level.IsFloor(destination))
+            return MoveOccupantResult.Failed(level, "Robot destination must be a floor cell.");
+
+        return MoveOccupantResult.Succeeded(level with { Robot = level.Robot with { Position = destination } });
+    }
+
+    private static MoveOccupantResult TryMoveProp(LevelState level, GridPosition source, GridPosition destination, PropState prop)
+    {
+        if (!level.IsFloor(destination))
+            return MoveOccupantResult.Failed(level, "Prop destination must be a floor cell.");
+
+        if (level.GetProp(destination).Type != EPropType.None)
+            return MoveOccupantResult.Failed(level, "Prop destination is already occupied.");
+
+        var next = level.SetProp(source, new()).SetProp(destination, prop);
+        if (prop.Type != EPropType.ReactorControl)
+            return MoveOccupantResult.Succeeded(next);
+
+        return MoveOccupantResult.Succeeded(next with {
+            Reactors = next.Reactors
+                           .Select(reactor => reactor.ControlPosition == source ? reactor with { ControlPosition = destination } : reactor)
+                           .ToArray()
+        });
+    }
+
+    private static MoveOccupantResult TryMoveLeak(LevelState level, LeakState leak, GridPosition destination)
+    {
+        if (leak.Carrier is ECarrierType.Fuel or ECarrierType.Coolant)
+        {
+            if (!level.IsFloor(destination))
+                return MoveOccupantResult.Failed(level, "Fuel and coolant leaks must move to a floor cell.");
+
+            var next = ClearLeak(level, leak)
+                .SetUnderground(leak.UndergroundPosition, leak.Carrier, new());
+            return MoveOccupantResult.Succeeded(SetLeak(next, destination, destination, leak.Carrier));
+        }
+
+        if (leak.Carrier == ECarrierType.Electricity)
+        {
+            if (!level.IsFloor(destination))
+                return MoveOccupantResult.Failed(level, "Electric leak destination must be an adjacent floor access cell.");
+
+            var undergroundPosition = leak.UndergroundPosition;
+            if (undergroundPosition.ManhattanDistance(destination) != 1)
+                return MoveOccupantResult.Failed(level, "Electric leak destination must stay adjacent to its underground wall cell.");
+
+            return MoveOccupantResult.Succeeded(SetLeak(ClearLeak(level, leak), undergroundPosition, destination, leak.Carrier));
+        }
+
+        return MoveOccupantResult.Failed(level, "Unsupported leak carrier.");
+    }
+
+    private static LevelState ClearLeak(LevelState level, LeakState leak)
+    {
+        return level with {
+            Leaks = level.Leaks.Where(candidate => candidate != leak).ToArray()
+        };
+    }
+
+    public static LevelState CycleElectricityLeakAccess(LevelState level, GridPosition undergroundPosition)
+    {
+        if (!level.InBounds(undergroundPosition))
+            return level;
+
+        if (!level.GetUnderground(undergroundPosition, ECarrierType.Electricity).IsPresent)
+            return level;
+
+        var accessPositions = undergroundPosition.Neighbors().Where(level.IsFloor).ToArray();
+        if (accessPositions.Length == 0)
+            return level;
+
+        var existingLeak = level.Leaks.FirstOrDefault(leak => leak.Carrier == ECarrierType.Electricity && leak.UndergroundPosition == undergroundPosition);
+        var nextAccessPosition = accessPositions[0];
+        if (existingLeak is not null)
+        {
+            var index = Array.IndexOf(accessPositions, existingLeak.AccessPosition);
+            nextAccessPosition = accessPositions[(index + 1) % accessPositions.Length];
+        }
+
+        return SetLeak(level, undergroundPosition, nextAccessPosition, ECarrierType.Electricity);
+    }
+
     public static LevelState Apply(LevelState level, GridPosition position, EditorToolCommand command)
     {
         if (!level.InBounds(position))
@@ -13,9 +139,9 @@ public static class LevelEditor
             EEditorTool.Wall => level.SetTerrain(position, ECellTerrain.Wall),
             EEditorTool.Underground => SetUnderground(level, position, command.Carrier),
             EEditorTool.Flow => SetCarrierProp(level, position, EPropType.Flow, command.Carrier),
-            EEditorTool.Consumer => SetCarrierProp(level, position, EPropType.Consumer, command.Carrier),
+            EEditorTool.Consumer => SetFloorProp(level, position, new() { Type = EPropType.Consumer, SwitchState = EPropSwitchState.Enabled }),
             EEditorTool.Junction => SetFloorProp(level, position, new() { Type = EPropType.Junction }),
-            EEditorTool.Door => SetFloorProp(level, position, new() { Type = EPropType.Door }),
+            EEditorTool.Door => ToggleOrSetDoor(level, position),
             EEditorTool.AllSeeingEyeTerminal => SetFloorProp(level, position, new() { Type = EPropType.AllSeeingEyeTerminal }),
             EEditorTool.RemedySupply => SetFloorProp(level, position, new() { Type = EPropType.RemedySupply, RemedyType = command.RemedyType }),
             EEditorTool.ReactorControl => SetReactorControl(level, position),
@@ -27,19 +153,6 @@ public static class LevelEditor
         };
     }
 
-    public static LevelState SetDoorEdge(LevelState level, GridPosition a, GridPosition b)
-    {
-        if (!level.IsFloor(a) || !level.IsFloor(b) || a.ManhattanDistance(b) != 1)
-            return level;
-
-        return level.SetProp(a, new() { Type = EPropType.Door }) with {
-            Doors = [
-                .. level.Doors.Where(door => !SameDoorEdge(door, a, b)),
-                new() { A = a, B = b, State = EDoorState.Closed }
-            ]
-        };
-    }
-
     public static LevelState SetLeak(LevelState level, GridPosition undergroundPosition, GridPosition accessPosition, ECarrierType carrier)
     {
         if (!level.InBounds(undergroundPosition) || !level.IsFloor(accessPosition))
@@ -51,7 +164,10 @@ public static class LevelEditor
         if (carrier == ECarrierType.Electricity && undergroundPosition.ManhattanDistance(accessPosition) != 1)
             return level;
 
-        var next = level.SetUnderground(undergroundPosition, carrier, new() { State = EUndergroundState.Leaking });
+        var next = level.SetUnderground(undergroundPosition, carrier, new() {
+            State = EUndergroundState.Leaking,
+            StructuralIntegrity = Balancing.Current.StructuralIntegrityLeakThreshold
+        });
         return next with {
             Leaks = [
                 .. next.Leaks.Where(leak => leak.UndergroundPosition != undergroundPosition || leak.Carrier != carrier),
@@ -64,32 +180,12 @@ public static class LevelEditor
         };
     }
 
-    public static LevelState BindReactorConsumer(LevelState level, int reactorId, ECarrierType carrier, GridPosition consumerPosition)
-    {
-        if (!level.InBounds(consumerPosition) || level.GetProp(consumerPosition) is not { Type: EPropType.Consumer } prop || prop.Carrier != carrier)
-            return level;
-
-        var reactors = level.Reactors.Select(reactor => reactor.ReactorId == reactorId ? BindConsumer(reactor, carrier, consumerPosition) : reactor).ToArray();
-        return level with { Reactors = reactors };
-    }
-
-    public static LevelState AddRuleEvent(LevelState level, RuleEventState ruleEvent)
-    {
-        var id = string.IsNullOrWhiteSpace(ruleEvent.Id) ? NextRuleEventId(level) : ruleEvent.Id;
-        var authoredEvent = ruleEvent with { Id = id };
-        return level with {
-            RuleEvents = [.. level.RuleEvents.Where(existing => existing.Id != id), authoredEvent]
-        };
-    }
-
-    public static LevelState RemoveRuleEvent(LevelState level, string id)
-    {
-        return level with { RuleEvents = level.RuleEvents.Where(ruleEvent => ruleEvent.Id != id).ToArray() };
-    }
-
     private static LevelState SetUnderground(LevelState level, GridPosition position, ECarrierType carrier)
     {
-        return level.SetUnderground(position, carrier, new() { State = EUndergroundState.Intact });
+        return level.SetUnderground(position, carrier, new() {
+            State = EUndergroundState.Intact,
+            StructuralIntegrity = Balancing.Current.MaxStructuralIntegrity
+        });
     }
 
     private static LevelState SetCarrierProp(LevelState level, GridPosition position, EPropType type, ECarrierType carrier)
@@ -113,6 +209,21 @@ public static class LevelEditor
         return level.IsFloor(position) ? level.SetProp(position, prop) : level;
     }
 
+    private static LevelState ToggleOrSetDoor(LevelState level, GridPosition position)
+    {
+        if (!level.IsFloor(position))
+            return level;
+
+        var prop = level.GetProp(position);
+        if (prop.Type == EPropType.Door)
+        {
+            var nextState = prop.DoorState == EDoorState.Open ? EDoorState.Closed : EDoorState.Open;
+            return level.SetProp(position, prop with { DoorState = nextState });
+        }
+
+        return level.SetProp(position, new() { Type = EPropType.Door, DoorState = EDoorState.Closed });
+    }
+
     private static LevelState SetReactorControl(LevelState level, GridPosition position)
     {
         if (!level.IsFloor(position))
@@ -125,10 +236,7 @@ public static class LevelEditor
                 .. level.Reactors,
                 new() {
                     ReactorId = id,
-                    ControlPosition = position,
-                    FuelConsumerPosition = position,
-                    CoolantConsumerPosition = position,
-                    ElectricityConsumerPosition = position
+                    ControlPosition = position
                 }
             ]
         };
@@ -141,28 +249,4 @@ public static class LevelEditor
 
         return SetLeak(level, position, position, carrier);
     }
-
-    private static bool SameDoorEdge(DoorState door, GridPosition a, GridPosition b)
-    {
-        return (door.A == a && door.B == b) || (door.A == b && door.B == a);
-    }
-
-    private static ReactorBinding BindConsumer(ReactorBinding reactor, ECarrierType carrier, GridPosition consumerPosition)
-    {
-        return carrier switch {
-            ECarrierType.Fuel => reactor with { FuelConsumerPosition = consumerPosition },
-            ECarrierType.Coolant => reactor with { CoolantConsumerPosition = consumerPosition },
-            ECarrierType.Electricity => reactor with { ElectricityConsumerPosition = consumerPosition },
-            _ => reactor
-        };
-    }
-
-    private static string NextRuleEventId(LevelState level)
-    {
-        var next = level.RuleEvents.Count + 1;
-        while (level.RuleEvents.Any(ruleEvent => ruleEvent.Id == $"rule-{next}"))
-            next++;
-
-        return $"rule-{next}";
-    }
 }

src/ReactorMaintenance.Simulation/LevelSerializer.cs

@@ -1,4 +1,4 @@
-using System.Text.Json;
+using System.Text.Json;
 using System.Text.Json.Serialization;
 
 namespace ReactorMaintenance.Simulation;
@@ -33,7 +33,7 @@ public static class LevelSerializer
         return level;
     }
 
-    private const int c_CurrentVersion = 2;
+    private const int c_CurrentVersion = 3;
 
     private static readonly JsonSerializerOptions s_Options = new() {
         WriteIndented = true,

src/ReactorMaintenance.Simulation/LevelStateExtensions.cs

@@ -42,7 +42,7 @@ public static class LevelStateExtensions
 
     public static bool IsClosedDoorEdge(this LevelState level, GridPosition a, GridPosition b)
     {
-        return level.Doors.Any(door => door.State == EDoorState.Closed && SameEdge(door.A, door.B, a, b));
+        return DoorBlocksEdge(level, a, b) || DoorBlocksEdge(level, b, a);
     }
 
     public static LevelState SetTerrain(this LevelState level, GridPosition position, ECellTerrain terrain)
@@ -103,14 +103,34 @@ public static class LevelStateExtensions
     private static LevelState ClearFloorOnlyState(this LevelState level, GridPosition position)
     {
         return level.SetSurface(position, new())
-                    .SetProp(position, new())
-                    .SetUnderground(position, ECarrierType.Fuel, new())
-                    .SetUnderground(position, ECarrierType.Coolant, new())
-                    .SetUnderground(position, ECarrierType.Electricity, new());
+                    .SetProp(position, new());
     }
 
-    private static bool SameEdge(GridPosition edgeA, GridPosition edgeB, GridPosition a, GridPosition b)
+    private static bool DoorBlocksEdge(LevelState level, GridPosition doorPosition, GridPosition neighbor)
     {
-        return (edgeA == a && edgeB == b) || (edgeA == b && edgeB == a);
+        if (!level.InBounds(doorPosition) || !level.InBounds(neighbor))
+            return false;
+
+        var prop = level.GetProp(doorPosition);
+        if (prop is not { Type: EPropType.Door, DoorState: EDoorState.Closed } || doorPosition.ManhattanDistance(neighbor) != 1)
+            return false;
+
+        var north = new GridPosition(doorPosition.X, doorPosition.Y - 1);
+        var south = new GridPosition(doorPosition.X, doorPosition.Y + 1);
+        var west = new GridPosition(doorPosition.X - 1, doorPosition.Y);
+        var east = new GridPosition(doorPosition.X + 1, doorPosition.Y);
+
+        if (IsWall(level, north) && IsWall(level, south))
+            return neighbor.Y == doorPosition.Y;
+
+        if (IsWall(level, west) && IsWall(level, east))
+            return neighbor.X == doorPosition.X;
+
+        return false;
+    }
+
+    private static bool IsWall(LevelState level, GridPosition position)
+    {
+        return level.InBounds(position) && level.GetTerrain(position) == ECellTerrain.Wall;
     }
 }

src/ReactorMaintenance.Simulation/LevelValidator.cs

@@ -14,7 +14,6 @@ public sealed class LevelValidator
         ValidateLeaks(level, errors);
         ValidateReactors(level, errors, warnings);
         ValidateJunctions(level, errors);
-        ValidateRuleEvents(level, errors);
         ValidateWarnings(level, warnings);
 
         return new() { Errors = errors, Warnings = warnings };
@@ -60,10 +59,21 @@ public sealed class LevelValidator
 
     private static void ValidateDoors(LevelState level, List<ValidationIssue> errors)
     {
-        foreach (var door in level.Doors)
+        foreach (var position in LevelTraversal.AllPositions(level))
         {
-            if (!level.IsFloor(door.A) || !level.IsFloor(door.B) || door.A.ManhattanDistance(door.B) != 1)
-                errors.Add(new("Door edge must connect two adjacent floor cells.", door.A));
+            if (level.GetProp(position).Type != EPropType.Door)
+                continue;
+
+            if (!level.IsFloor(position))
+            {
+                errors.Add(new("Door prop must be placed on a floor cell.", position));
+                continue;
+            }
+
+            var northSouthWalls = IsWall(level, new(position.X, position.Y - 1)) && IsWall(level, new(position.X, position.Y + 1));
+            var westEastWalls = IsWall(level, new(position.X - 1, position.Y)) && IsWall(level, new(position.X + 1, position.Y));
+            if (northSouthWalls == westEastWalls)
+                errors.Add(new("Door must be surrounded by one opposing pair of wall cells.", position));
         }
     }
 
@@ -94,21 +104,14 @@ public sealed class LevelValidator
         foreach (var reactor in level.Reactors)
         {
             if (!IsProp(level, reactor.ControlPosition, EPropType.ReactorControl))
-                errors.Add(new("Reactor binding control position must point to a reactor control prop.", reactor.ControlPosition));
-
-            ValidateConsumerBinding(level, reactor.FuelConsumerPosition, ECarrierType.Fuel, errors);
-            ValidateConsumerBinding(level, reactor.CoolantConsumerPosition, ECarrierType.Coolant, errors);
-            ValidateConsumerBinding(level, reactor.ElectricityConsumerPosition, ECarrierType.Electricity, errors);
+                errors.Add(new("Reactor control position must point to a reactor control prop.", reactor.ControlPosition));
 
             if (!reactor.Ready)
                 warnings.Add(new("Reactor is initially unready.", reactor.ControlPosition));
         }
-    }
 
-    private static void ValidateConsumerBinding(LevelState level, GridPosition position, ECarrierType carrier, List<ValidationIssue> errors)
-    {
-        if (!level.InBounds(position) || level.GetProp(position) is not { Type: EPropType.Consumer } prop || prop.Carrier != carrier)
-            errors.Add(new($"Missing or invalid {carrier} consumer binding.", position));
+        if (level.RequiredFuelConsumers < 0 || level.RequiredCoolantConsumers < 0 || level.RequiredElectricityConsumers < 0)
+            errors.Add(new("Required consumer counts cannot be negative."));
     }
 
     private static void ValidateJunctions(LevelState level, List<ValidationIssue> errors)
@@ -117,111 +120,6 @@ public sealed class LevelValidator
             errors.AddRange(junction.Errors.Select(error => new ValidationIssue(error, junction.Position)));
     }
 
-    private static void ValidateRuleEvents(LevelState level, List<ValidationIssue> errors)
-    {
-        foreach (var ruleEvent in level.RuleEvents)
-        {
-            foreach (var predicate in ruleEvent.Predicates)
-                ValidateRulePredicate(level, predicate, errors);
-
-            foreach (var effect in ruleEvent.Effects)
-                ValidateRuleEffect(level, effect, errors);
-        }
-    }
-
-    private static void ValidateRulePredicate(LevelState level, RulePredicate predicate, List<ValidationIssue> errors)
-    {
-        switch (predicate.Kind)
-        {
-            case ERulePredicateKind.PropStateAt:
-                if (!level.InBounds(predicate.Position) || level.GetProp(predicate.Position).Type == EPropType.None)
-                    errors.Add(new("Rule prop predicate must target a prop.", predicate.Position));
-                break;
-            case ERulePredicateKind.ConsumerStateAt:
-                if (!IsProp(level, predicate.Position, EPropType.Consumer))
-                    errors.Add(new("Rule consumer predicate must target a consumer prop.", predicate.Position));
-                break;
-            case ERulePredicateKind.NetworkBandAt:
-                if (!level.InBounds(predicate.Position) || !level.GetUnderground(predicate.Position, predicate.Carrier).IsPresent)
-                    errors.Add(new("Rule network predicate must target an underground cell.", predicate.Position));
-                break;
-            case ERulePredicateKind.SurfaceBandAt:
-            case ERulePredicateKind.RobotAt:
-                if (!level.IsFloor(predicate.Position))
-                    errors.Add(new("Rule floor predicate must target a floor cell.", predicate.Position));
-                break;
-            case ERulePredicateKind.ReactorReadyIs:
-            case ERulePredicateKind.ReactorWonIs:
-                ValidateOptionalReactorId(level, predicate.ReactorId, predicate.Position, errors);
-                break;
-        }
-    }
-
-    private static void ValidateRuleEffect(LevelState level, RuleEffect effect, List<ValidationIssue> errors)
-    {
-        if (RequiresNonNegativeAmount(effect.Kind) && effect.Amount < 0)
-            errors.Add(new("Rule effect amount must be non-negative.", effect.Position));
-
-        switch (effect.Kind)
-        {
-            case ERuleEffectKind.StartLeak:
-                ValidateRuleLeakEffect(level, effect, errors);
-                break;
-            case ERuleEffectKind.WorsenLeak:
-            case ERuleEffectKind.RepairNetworkCell:
-            case ERuleEffectKind.DisableNetworkCell:
-                if (!level.InBounds(effect.Position) || !level.GetUnderground(effect.Position, effect.Carrier).IsPresent)
-                    errors.Add(new("Rule network effect must target an underground cell.", effect.Position));
-                break;
-            case ERuleEffectKind.SetPropEnabled:
-                if (!level.InBounds(effect.Position) || level.GetProp(effect.Position).Type == EPropType.None)
-                    errors.Add(new("Rule prop effect must target a prop.", effect.Position));
-                break;
-            case ERuleEffectKind.AddSurfaceHazard:
-            case ERuleEffectKind.RemoveSurfaceHazard:
-            case ERuleEffectKind.AddHeat:
-            case ERuleEffectKind.RemoveHeat:
-                if (!level.IsFloor(effect.Position))
-                    errors.Add(new("Rule surface effect must target a floor cell.", effect.Position));
-                break;
-        }
-    }
-
-    private static bool RequiresNonNegativeAmount(ERuleEffectKind kind)
-    {
-        return kind is ERuleEffectKind.AddSurfaceHazard
-            or ERuleEffectKind.RemoveSurfaceHazard
-            or ERuleEffectKind.AddHeat
-            or ERuleEffectKind.RemoveHeat
-            or ERuleEffectKind.AddInventory
-            or ERuleEffectKind.RemoveInventory;
-    }
-
-    private static void ValidateRuleLeakEffect(LevelState level, RuleEffect effect, List<ValidationIssue> errors)
-    {
-        var accessPosition = effect.AccessPosition ?? effect.Position;
-        if (!level.InBounds(effect.Position) || !level.GetUnderground(effect.Position, effect.Carrier).IsPresent)
-            errors.Add(new("Rule leak effect must target an underground cell.", effect.Position));
-
-        if (!level.IsFloor(accessPosition))
-        {
-            errors.Add(new("Rule leak effect must have valid floor access.", accessPosition));
-            return;
-        }
-
-        if (effect.Carrier is ECarrierType.Fuel or ECarrierType.Coolant && effect.Position != accessPosition)
-            errors.Add(new("Rule fuel and coolant leak effects must use their underground coordinate as access.", accessPosition));
-
-        if (effect.Carrier == ECarrierType.Electricity && effect.Position.ManhattanDistance(accessPosition) != 1)
-            errors.Add(new("Rule electricity leak effect access must be an adjacent floor face.", accessPosition));
-    }
-
-    private static void ValidateOptionalReactorId(LevelState level, int reactorId, GridPosition position, List<ValidationIssue> errors)
-    {
-        if (reactorId > 0 && level.Reactors.All(reactor => reactor.ReactorId != reactorId))
-            errors.Add(new("Rule reactor predicate must reference an existing reactor.", position));
-    }
-
     private static void ValidateWarnings(LevelState level, List<ValidationIssue> warnings)
     {
         foreach (var carrier in Enum.GetValues<ECarrierType>())
@@ -243,12 +141,31 @@ public sealed class LevelValidator
             {
                 var position = new GridPosition(x, y);
                 var prop = level.GetProp(position);
-                if (prop.Type == EPropType.Consumer && prop.SwitchState == EPropSwitchState.Enabled && !HasSourcePath(level, position, prop.Carrier))
-                    warnings.Add(new("Enabled consumer is initially starved.", position));
+                if (prop.Type != EPropType.Consumer || prop.SwitchState != EPropSwitchState.Enabled)
+                    continue;
+
+                var hasPresentNetwork = false;
+                foreach (var carrier in Enum.GetValues<ECarrierType>())
+                {
+                    if (!level.GetUnderground(position, carrier).IsPresent)
+                        continue;
+
+                    hasPresentNetwork = true;
+                    if (!HasSourcePath(level, position, carrier))
+                        warnings.Add(new($"Enabled consumer has no {carrier} source path.", position));
+                }
+
+                if (!hasPresentNetwork)
+                    warnings.Add(new("Enabled consumer has no underground network beneath it.", position));
             }
         }
     }
 
+    private static bool IsWall(LevelState level, GridPosition position)
+    {
+        return level.InBounds(position) && level.GetTerrain(position) == ECellTerrain.Wall;
+    }
+
     private static bool HasSourcePath(LevelState level, GridPosition start, ECarrierType carrier)
     {
         if (!level.GetUnderground(start, carrier).CarriesFlow)

src/ReactorMaintenance.Simulation/Models/DoorState.cs

@@ -1,8 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public sealed record DoorState
-{
-    public GridPosition A { get; init; } = new(0, 0);
-    public GridPosition B { get; init; } = new(0, 0);
-    public EDoorState State { get; init; } = EDoorState.Closed;
-}

src/ReactorMaintenance.Simulation/Models/EForecastKind.cs

@@ -6,5 +6,5 @@ public enum EForecastKind
     ReactorReady,
     ConsumerStarved,
     HazardGrowth,
-    RuleEvent
+    StructuralIntegrity
 }

src/ReactorMaintenance.Simulation/Models/ERuleEffectKind.cs

@@ -1,18 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public enum ERuleEffectKind
-{
-    StartLeak,
-    WorsenLeak,
-    RepairNetworkCell,
-    DisableNetworkCell,
-    SetPropEnabled,
-    AddSurfaceHazard,
-    RemoveSurfaceHazard,
-    AddHeat,
-    RemoveHeat,
-    AddInventory,
-    RemoveInventory,
-    MarkTerminalLoss,
-    EmitWarning
-}

src/ReactorMaintenance.Simulation/Models/ERuleEventPhase.cs

@@ -1,7 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public enum ERuleEventPhase
-{
-    StartOfSimulation,
-    EndOfTurn
-}

src/ReactorMaintenance.Simulation/Models/ERulePredicateKind.cs

@@ -1,17 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public enum ERulePredicateKind
-{
-    TurnAtLeast,
-    LevelStateIs,
-    ReactorReadyIs,
-    ReactorLostIs,
-    ReactorWonIs,
-    PropStateAt,
-    ConsumerStateAt,
-    NetworkBandAt,
-    SurfaceBandAt,
-    RobotAt,
-    RobotInventoryAtLeast,
-    AllSeeingEyeUnlocked
-}

src/ReactorMaintenance.Simulation/Models/GlobalState.cs

@@ -3,10 +3,8 @@
 public sealed record GlobalState
 {
     public int Turn { get; init; }
-    public int ActionsRemaining { get; init; } = Balancing.Current.ActionsPerTurn;
     public ELevelState LevelState { get; init; } = ELevelState.Stable;
     public string Status { get; init; } = "STABLE";
-    public bool AllSeeingEyeUnlocked { get; init; }
     public bool TerminalLoss { get; init; }
     public IReadOnlyList<string> Warnings { get; init; } = Array.Empty<string>();
 }

src/ReactorMaintenance.Simulation/Models/LevelState.cs

@@ -16,10 +16,11 @@ public sealed record LevelState
     public UndergroundCell[] Electricity { get; init; } = LevelStateFactory.CreateUnderground(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
     public SurfaceState[] Surface { get; init; } = LevelStateFactory.CreateSurface(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
     public PropState[] Props { get; init; } = LevelStateFactory.CreateProps(Balancing.Current.DefaultLevelWidth, Balancing.Current.DefaultLevelHeight);
-    public IReadOnlyList<DoorState> Doors { get; init; } = Array.Empty<DoorState>();
     public IReadOnlyList<LeakState> Leaks { get; init; } = Array.Empty<LeakState>();
-    public IReadOnlyList<ReactorBinding> Reactors { get; init; } = Array.Empty<ReactorBinding>();
-    public IReadOnlyList<RuleEventState> RuleEvents { get; init; } = Array.Empty<RuleEventState>();
+    public IReadOnlyList<ReactorState> Reactors { get; init; } = Array.Empty<ReactorState>();
+    public int RequiredFuelConsumers { get; init; } = 1;
+    public int RequiredCoolantConsumers { get; init; } = 1;
+    public int RequiredElectricityConsumers { get; init; } = 1;
     public RobotState Robot { get; init; } = new();
     public GlobalState Global { get; init; } = new();
     public IReadOnlyList<Forecast> Forecasts { get; init; } = Array.Empty<Forecast>();

src/ReactorMaintenance.Simulation/Models/PropState.cs

@@ -2,14 +2,28 @@
 
 public sealed record PropState
 {
+    public EConsumerServiceState ServiceStateFor(ECarrierType carrier)
+    {
+        return carrier switch {
+            ECarrierType.Fuel => FuelServiceState,
+            ECarrierType.Coolant => CoolantServiceState,
+            ECarrierType.Electricity => ElectricityServiceState,
+            _ => EConsumerServiceState.Unknown
+        };
+    }
+
     public EPropType Type { get; init; }
     public ECarrierType Carrier { get; init; }
     public EPropSwitchState SwitchState { get; init; } = EPropSwitchState.Enabled;
     public EConsumerServiceState ServiceState { get; init; } = EConsumerServiceState.Unknown;
+    public EConsumerServiceState FuelServiceState { get; init; } = EConsumerServiceState.Unknown;
+    public EConsumerServiceState CoolantServiceState { get; init; } = EConsumerServiceState.Unknown;
+    public EConsumerServiceState ElectricityServiceState { get; init; } = EConsumerServiceState.Unknown;
     public int JunctionMode { get; init; }
     public ERemedyType RemedyType { get; init; }
     public bool Depleted { get; init; }
     public int ReactorId { get; init; }
+    public EDoorState DoorState { get; init; } = EDoorState.Closed;
 
     public bool IsEnabled => SwitchState == EPropSwitchState.Enabled;
 }

src/ReactorMaintenance.Simulation/Models/ReactorBinding.cs

@@ -1,12 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public sealed record ReactorBinding
-{
-    public int ReactorId { get; init; }
-    public GridPosition ControlPosition { get; init; } = new(0, 0);
-    public GridPosition FuelConsumerPosition { get; init; } = new(0, 0);
-    public GridPosition CoolantConsumerPosition { get; init; } = new(0, 0);
-    public GridPosition ElectricityConsumerPosition { get; init; } = new(0, 0);
-    public bool Ready { get; init; }
-    public bool Activated { get; init; }
-}

src/ReactorMaintenance.Simulation/Models/ReactorState.cs

@@ -0,0 +1,9 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed record ReactorState
+{
+    public int ReactorId { get; init; }
+    public GridPosition ControlPosition { get; init; } = new(0, 0);
+    public bool Ready { get; init; }
+    public bool Activated { get; init; }
+}

src/ReactorMaintenance.Simulation/Models/RuleEffect.cs

@@ -1,13 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public sealed record RuleEffect
-{
-    public ERuleEffectKind Kind { get; init; }
-    public GridPosition Position { get; init; } = new(0, 0);
-    public GridPosition? AccessPosition { get; init; }
-    public ECarrierType Carrier { get; init; }
-    public ERemedyType Remedy { get; init; }
-    public float Amount { get; init; }
-    public EPropSwitchState PropSwitchState { get; init; }
-    public string Message { get; init; } = string.Empty;
-}

src/ReactorMaintenance.Simulation/Models/RuleEventState.cs

@@ -1,14 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public sealed record RuleEventState
-{
-    public string Id { get; init; } = string.Empty;
-    public bool Enabled { get; init; } = true;
-    public bool Repeat { get; init; }
-    public bool Triggered { get; init; }
-    public int Priority { get; init; }
-    public ERuleEventPhase Phase { get; init; }
-    public IReadOnlyList<RulePredicate> Predicates { get; init; } = Array.Empty<RulePredicate>();
-    public IReadOnlyList<RuleEffect> Effects { get; init; } = Array.Empty<RuleEffect>();
-    public string ForecastText { get; init; } = string.Empty;
-}

src/ReactorMaintenance.Simulation/Models/RulePredicate.cs

@@ -1,18 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-public sealed record RulePredicate
-{
-    public ERulePredicateKind Kind { get; init; }
-    public GridPosition Position { get; init; } = new(0, 0);
-    public int ReactorId { get; init; }
-    public int Turn { get; init; }
-    public ELevelState LevelState { get; init; }
-    public EPropSwitchState PropSwitchState { get; init; }
-    public EConsumerServiceState ConsumerServiceState { get; init; }
-    public ECarrierType Carrier { get; init; }
-    public ENetworkValueKind NetworkValue { get; init; }
-    public ERemedyType Remedy { get; init; }
-    public EBand Band { get; init; }
-    public int InventoryCount { get; init; }
-    public bool BoolValue { get; init; }
-}

src/ReactorMaintenance.Simulation/Models/UndergroundCell.cs

@@ -5,6 +5,7 @@ public sealed record UndergroundCell
     public EUndergroundState State { get; init; }
     public float Amount { get; init; }
     public float Intensity { get; init; }
+    public int StructuralIntegrity { get; init; } = Balancing.Current.MaxStructuralIntegrity;
 
     public bool IsPresent => State != EUndergroundState.Absent;
     public bool CarriesFlow => State is EUndergroundState.Intact or EUndergroundState.Leaking;

src/ReactorMaintenance.Simulation/SimulationEngine.cs

@@ -4,22 +4,27 @@ public sealed class SimulationEngine
 {
     public LevelState MoveRobot(LevelState level, GridPosition destination)
     {
-        return PlayerActionSystem.MoveRobot(level, destination, SpendAction);
+        return PlayerActionSystem.MoveRobot(level, destination);
     }
 
     public LevelState InteractProp(LevelState level)
     {
-        return PlayerActionSystem.InteractProp(level, SpendAction);
+        return PlayerActionSystem.InteractProp(level, ResolveStep);
     }
 
     public LevelState InteractLeak(LevelState level, ECarrierType carrier, bool useRemedy)
     {
-        return PlayerActionSystem.InteractLeak(level, carrier, useRemedy, SpendAction);
+        return PlayerActionSystem.InteractLeak(level, carrier, useRemedy, ResolveStep);
     }
 
     public LevelState ApplyHeatShield(LevelState level)
     {
-        return PlayerActionSystem.ApplyHeatShield(level, SpendAction);
+        return PlayerActionSystem.ApplyHeatShield(level, ResolveStep);
+    }
+
+    private LevelState ResolveStep(LevelState level)
+    {
+        return ResolveStep(level, true);
     }
 
     public LevelState ActivateReactor(LevelState level)
@@ -29,45 +34,37 @@ public sealed class SimulationEngine
 
     public LevelState EndTurn(LevelState level)
     {
-        return ResolveTurn(level with { Global = level.Global with { ActionsRemaining = 0 } });
+        return ResolveStep(level);
     }
 
     public LevelState AdvanceTurn(LevelState level)
     {
-        return ResolveTurn(level);
+        return ResolveStep(level);
     }
 
     public IReadOnlyList<Forecast> Forecast(LevelState level)
     {
-        return ForecastSystem.Forecast(level, simulated => ResolveTurn(simulated, false));
+        return ForecastSystem.Forecast(level, simulated => ResolveStep(simulated, false));
     }
 
-    private LevelState SpendAction(LevelState level)
-    {
-        var actions = Math.Max(0, level.Global.ActionsRemaining - 1);
-        var next = level with { Global = level.Global with { ActionsRemaining = actions } };
-        return actions == 0 ? ResolveTurn(next) : next;
-    }
-
-    private LevelState ResolveTurn(LevelState level, bool refreshForecasts = true)
+    private LevelState ResolveStep(LevelState level, bool refreshForecasts)
     {
         var report = m_Validator.Validate(level);
         if (!report.IsValid)
             return level with { Global = level.Global with { LevelState = ELevelState.Lost, Status = report.Errors[0].Message } };
 
-        var next = RuleEventSystem.Apply(level, ERuleEventPhase.StartOfSimulation);
+        var next = level;
         next = NetworkPropagationSystem.Propagate(next);
         next = ConsumerSystem.Resolve(next);
+        next = StructuralIntegritySystem.Resolve(next);
         next = LeakSystem.Inject(next);
         next = SurfaceInteractionSystem.Resolve(next);
         next = RobotSafetySystem.Resolve(next);
         next = ReactorSystem.DeriveState(next);
-        next = RuleEventSystem.Apply(next, ERuleEventPhase.EndOfTurn);
         next = SurfaceInteractionSystem.AdvanceDurations(next);
         next = next with {
             Global = next.Global with {
-                Turn = next.Global.Turn + 1,
-                ActionsRemaining = Balancing.Current.ActionsPerTurn
+                Turn = next.Global.Turn + 1
             }
         };
 

src/ReactorMaintenance.Simulation/Systems/ConsumerSystem.cs

@@ -14,15 +14,59 @@ internal static class ConsumerSystem
 
             if (prop.SwitchState == EPropSwitchState.Disabled)
             {
-                props[index] = prop with { ServiceState = EConsumerServiceState.Disabled };
+                var disabledFuel = DisabledServiceStateFor(level, position, ECarrierType.Fuel);
+                var disabledCoolant = DisabledServiceStateFor(level, position, ECarrierType.Coolant);
+                var disabledElectricity = DisabledServiceStateFor(level, position, ECarrierType.Electricity);
+                props[index] = prop with {
+                    ServiceState = Aggregate(disabledFuel, disabledCoolant, disabledElectricity),
+                    FuelServiceState = disabledFuel,
+                    CoolantServiceState = disabledCoolant,
+                    ElectricityServiceState = disabledElectricity
+                };
                 continue;
             }
 
-            var underground = level.GetUnderground(position, prop.Carrier);
-            var supplied = underground.Amount >= Balancing.Current.ConsumerRequiredAmount && underground.Intensity >= Balancing.Current.ConsumerRequiredIntensity;
-            props[index] = prop with { ServiceState = supplied ? EConsumerServiceState.Producing : EConsumerServiceState.Starved };
+            var fuel = ServiceStateFor(level, position, ECarrierType.Fuel);
+            var coolant = ServiceStateFor(level, position, ECarrierType.Coolant);
+            var electricity = ServiceStateFor(level, position, ECarrierType.Electricity);
+            props[index] = prop with {
+                ServiceState = Aggregate(fuel, coolant, electricity),
+                FuelServiceState = fuel,
+                CoolantServiceState = coolant,
+                ElectricityServiceState = electricity
+            };
         }
 
         return level with { Props = props };
     }
+
+    private static EConsumerServiceState ServiceStateFor(LevelState level, GridPosition position, ECarrierType carrier)
+    {
+        var underground = level.GetUnderground(position, carrier);
+        if (!underground.IsPresent)
+            return EConsumerServiceState.Unknown;
+
+        var supplied = underground.Amount >= Balancing.Current.ConsumerRequiredAmount && underground.Intensity >= Balancing.Current.ConsumerRequiredIntensity;
+        return supplied ? EConsumerServiceState.Producing : EConsumerServiceState.Starved;
+    }
+
+    private static EConsumerServiceState DisabledServiceStateFor(LevelState level, GridPosition position, ECarrierType carrier)
+    {
+        return level.GetUnderground(position, carrier).IsPresent ? EConsumerServiceState.Disabled : EConsumerServiceState.Unknown;
+    }
+
+    private static EConsumerServiceState Aggregate(params EConsumerServiceState[] states)
+    {
+        var participating = states.Where(state => state != EConsumerServiceState.Unknown).ToArray();
+        if (participating.Length == 0)
+            return EConsumerServiceState.Unknown;
+
+        if (participating.Any(state => state == EConsumerServiceState.Starved))
+            return EConsumerServiceState.Starved;
+
+        if (participating.Any(state => state == EConsumerServiceState.Disabled))
+            return EConsumerServiceState.Disabled;
+
+        return EConsumerServiceState.Producing;
+    }
 }

src/ReactorMaintenance.Simulation/Systems/ForecastSystem.cs

@@ -44,15 +44,25 @@ internal static class ForecastSystem
         foreach (var position in LevelTraversal.AllPositions(level))
         {
             var prop = level.GetProp(position);
-            if (prop.Type == EPropType.Consumer && prop.ServiceState == EConsumerServiceState.Starved)
-                forecasts.Add(new(EForecastKind.ConsumerStarved, position, turn, $"{prop.Carrier} consumer starved"));
+            if (prop.Type == EPropType.Consumer)
+            {
+                foreach (var carrier in Enum.GetValues<ECarrierType>())
+                {
+                    if (prop.ServiceStateFor(carrier) == EConsumerServiceState.Starved)
+                        forecasts.Add(new(EForecastKind.ConsumerStarved, position, turn, $"{carrier} consumer starved"));
+                }
+            }
+
+            foreach (var carrier in Enum.GetValues<ECarrierType>())
+            {
+                var underground = level.GetUnderground(position, carrier);
+                if (underground.IsPresent && underground.StructuralIntegrity <= Balancing.Current.StructuralIntegrityLeakThreshold)
+                    forecasts.Add(new(EForecastKind.StructuralIntegrity, position, turn, $"{carrier} structural integrity failing"));
+            }
 
             var surface = level.GetSurface(position);
             if (SimulationBands.Fuel(surface.Fuel) == EBand.Critical || SimulationBands.Coolant(surface.Coolant) == EBand.Critical || SimulationBands.Electricity(surface.Electricity) == EBand.Critical || SimulationBands.Heat(surface.Heat) == EBand.Critical)
                 forecasts.Add(new(EForecastKind.HazardGrowth, position, turn, "Critical hazard"));
         }
-
-        foreach (var ruleEvent in level.RuleEvents.Where(ruleEvent => ruleEvent.Enabled && !string.IsNullOrWhiteSpace(ruleEvent.ForecastText) && ruleEvent.Predicates.All(predicate => RuleEventSystem.PredicateMatches(level, predicate))))
-            forecasts.Add(new(EForecastKind.RuleEvent, null, turn, ruleEvent.ForecastText));
     }
 }

src/ReactorMaintenance.Simulation/Systems/PlayerActionSystem.cs

@@ -2,23 +2,23 @@
 
 internal static class PlayerActionSystem
 {
-    public static LevelState MoveRobot(LevelState level, GridPosition destination, Func<LevelState, LevelState> spendAction)
+    public static LevelState MoveRobot(LevelState level, GridPosition destination)
     {
-        if (!CanSpendAction(level) || !level.IsFloor(destination) || level.Robot.Position.ManhattanDistance(destination) != 1)
+        if (!CanAct(level) || !level.IsFloor(destination) || level.Robot.Position.ManhattanDistance(destination) != 1)
             return Refuse(level, "MOVE BLOCKED");
 
-        return spendAction(level with {
+        return level with {
             Robot = level.Robot with {
                 Position = destination,
                 HeatImmunitySteps = Math.Max(0, level.Robot.HeatImmunitySteps - 1)
             }
-        });
+        };
     }
 
-    public static LevelState InteractProp(LevelState level, Func<LevelState, LevelState> spendAction)
+    public static LevelState InteractProp(LevelState level, Func<LevelState, LevelState> resolveLengthyAction)
     {
-        if (!CanSpendAction(level))
-            return Refuse(level, "NO ACTIONS");
+        if (!CanAct(level))
+            return Refuse(level, "NO CONTROL");
 
         var position = level.Robot.Position;
         var prop = level.GetProp(position);
@@ -28,20 +28,20 @@ internal static class PlayerActionSystem
         var next = prop.Type switch {
             EPropType.Flow or EPropType.Consumer => ToggleProp(level, position, prop),
             EPropType.Junction => CycleJunctionMode(level, position, prop),
-            EPropType.Door => ToggleDoor(level, position),
-            EPropType.AllSeeingEyeTerminal => level with { Global = level.Global with { AllSeeingEyeUnlocked = true, Status = "ALL-SEEING-EYE ONLINE" } },
+            EPropType.Door => ToggleDoor(level, position, prop),
+            EPropType.AllSeeingEyeTerminal => level with { Global = level.Global with { Status = "ALL-SEEING-EYE AVAILABLE" } },
             EPropType.RemedySupply => PickUpRemedy(level, position, prop),
             EPropType.ReactorControl => ReactorSystem.Activate(level),
             _ => level
         };
 
-        return spendAction(next);
+        return prop.Type == EPropType.AllSeeingEyeTerminal || prop.Type == EPropType.ReactorControl ? next : resolveLengthyAction(next);
     }
 
-    public static LevelState InteractLeak(LevelState level, ECarrierType carrier, bool useRemedy, Func<LevelState, LevelState> spendAction)
+    public static LevelState InteractLeak(LevelState level, ECarrierType carrier, bool useRemedy, Func<LevelState, LevelState> resolveLengthyAction)
     {
-        if (!CanSpendAction(level))
-            return Refuse(level, "NO ACTIONS");
+        if (!CanAct(level))
+            return Refuse(level, "NO CONTROL");
 
         var leakIndex = level.Leaks.ToList().FindIndex(leak => !leak.Repaired && leak.Carrier == carrier && leak.AccessPosition == level.Robot.Position);
         if (leakIndex < 0)
@@ -49,15 +49,15 @@ internal static class PlayerActionSystem
 
         var leak = level.Leaks[leakIndex];
         var next = useRemedy ? ApplyElementRemedy(level, leak) : RepairLeak(level, leakIndex, leak);
-        return spendAction(next);
+        return resolveLengthyAction(next);
     }
 
-    public static LevelState ApplyHeatShield(LevelState level, Func<LevelState, LevelState> spendAction)
+    public static LevelState ApplyHeatShield(LevelState level, Func<LevelState, LevelState> resolveLengthyAction)
     {
-        if (!CanSpendAction(level) || level.Robot.HeatShields <= 0)
+        if (!CanAct(level) || level.Robot.HeatShields <= 0)
             return Refuse(level, "NO HEAT SHIELD");
 
-        return spendAction(level with {
+        return resolveLengthyAction(level with {
             Robot = level.Robot.Spend(ERemedyType.HeatShield) with { HeatImmunitySteps = Balancing.Current.HeatShieldSteps }
         });
     }
@@ -68,15 +68,10 @@ internal static class PlayerActionSystem
         return level.SetProp(position, prop with { SwitchState = switchState });
     }
 
-    private static LevelState ToggleDoor(LevelState level, GridPosition position)
+    private static LevelState ToggleDoor(LevelState level, GridPosition position, PropState prop)
     {
-        var doors = level.Doors.ToArray();
-        var index = Array.FindIndex(doors, door => door.A == position || door.B == position);
-        if (index < 0)
-            return level;
-
-        doors[index] = doors[index] with { State = doors[index].State == EDoorState.Open ? EDoorState.Closed : EDoorState.Open };
-        return level with { Doors = doors };
+        var doorState = prop.DoorState == EDoorState.Open ? EDoorState.Closed : EDoorState.Open;
+        return level.SetProp(position, prop with { DoorState = doorState });
     }
 
     private static LevelState PickUpRemedy(LevelState level, GridPosition position, PropState prop)
@@ -91,7 +86,12 @@ internal static class PlayerActionSystem
     {
         var leaks = level.Leaks.ToArray();
         leaks[leakIndex] = leak with { Repaired = true };
-        return level.SetUnderground(leak.UndergroundPosition, leak.Carrier, level.GetUnderground(leak.UndergroundPosition, leak.Carrier) with { State = EUndergroundState.Intact }) with { Leaks = leaks };
+        return level.SetUnderground(leak.UndergroundPosition, leak.Carrier, level.GetUnderground(leak.UndergroundPosition, leak.Carrier) with {
+            State = EUndergroundState.Intact,
+            StructuralIntegrity = Balancing.Current.MaxStructuralIntegrity
+        }) with {
+            Leaks = leaks
+        };
     }
 
     private static LevelState ApplyElementRemedy(LevelState level, LeakState leak)
@@ -121,9 +121,9 @@ internal static class PlayerActionSystem
         return level.SetProp(position, prop with { JunctionMode = (prop.JunctionMode + 1) % ratios.Count });
     }
 
-    private static bool CanSpendAction(LevelState level)
+    private static bool CanAct(LevelState level)
     {
-        return level.Global.LevelState is not (ELevelState.Lost or ELevelState.Won) && level.Global.ActionsRemaining > 0;
+        return level.Global.LevelState is not (ELevelState.Lost or ELevelState.Won);
     }
 
     private static LevelState Refuse(LevelState level, string message)

src/ReactorMaintenance.Simulation/Systems/ReactorSystem.cs

@@ -34,41 +34,54 @@ internal static class ReactorSystem
             return level with { Reactors = reactors, Global = level.Global with { LevelState = ELevelState.Lost, TerminalLoss = true, Status = "REACTOR HEAT TERMINAL" } };
 
         var hasCritical = level.Surface.Any(surface => SimulationBands.Fuel(surface.Fuel) == EBand.Critical || SimulationBands.Coolant(surface.Coolant) == EBand.Critical || SimulationBands.Electricity(surface.Electricity) == EBand.Critical || SimulationBands.Heat(surface.Heat) == EBand.Critical);
-        var hasCaution = hasCritical || level.Props.Any(prop => prop.ServiceState is EConsumerServiceState.Starved or EConsumerServiceState.Disabled) || level.Leaks.Any(leak => !leak.Repaired);
+        var hasCaution = hasCritical
+                      || !HasRequiredConsumers(level)
+                      || level.Props.Any(prop => prop.Type == EPropType.Consumer && HasConsumerTrouble(prop))
+                      || level.Leaks.Any(leak => !leak.Repaired);
         var state = hasCritical ? ELevelState.Critical :
             hasCaution ? ELevelState.Caution : ELevelState.Stable;
         return level with { Reactors = reactors, Global = level.Global with { LevelState = state, Status = state.ToString().ToUpperInvariant() } };
     }
 
-    public static bool MatchesReady(LevelState level, RulePredicate predicate)
+    private static bool IsReady(LevelState level, ReactorState reactor)
     {
-        return level.Reactors.Any(reactor => MatchesId(reactor, predicate.ReactorId) && reactor.Ready) == predicate.BoolValue;
-    }
-
-    public static bool MatchesWon(LevelState level, RulePredicate predicate)
-    {
-        var won = predicate.ReactorId > 0
-            ? level.Reactors.Any(reactor => reactor.ReactorId == predicate.ReactorId && reactor.Activated)
-            : level.Global.LevelState == ELevelState.Won || level.Reactors.Any(reactor => reactor.Activated);
-        return won == predicate.BoolValue;
-    }
-
-    private static bool IsReady(LevelState level, ReactorBinding reactor)
-    {
-        return HasProducingConsumer(level, reactor.FuelConsumerPosition, ECarrierType.Fuel)
-            && HasProducingConsumer(level, reactor.CoolantConsumerPosition, ECarrierType.Coolant)
-            && HasProducingConsumer(level, reactor.ElectricityConsumerPosition, ECarrierType.Electricity)
+        return ReactorFeedsPresentAndProducing(level, reactor.ControlPosition)
+            && ProducingConsumerCount(level, ECarrierType.Fuel) >= level.RequiredFuelConsumers
+            && ProducingConsumerCount(level, ECarrierType.Coolant) >= level.RequiredCoolantConsumers
+            && ProducingConsumerCount(level, ECarrierType.Electricity) >= level.RequiredElectricityConsumers
             && level.GetSurface(reactor.ControlPosition).Heat < Balancing.Current.TerminalHeat;
     }
 
-    private static bool HasProducingConsumer(LevelState level, GridPosition position, ECarrierType carrier)
+    private static bool ReactorFeedsPresentAndProducing(LevelState level, GridPosition position)
     {
-        return level.InBounds(position) && level.GetProp(position) is { Type: EPropType.Consumer, Carrier: var consumerCarrier, ServiceState: EConsumerServiceState.Producing } && consumerCarrier == carrier;
+        foreach (var carrier in Enum.GetValues<ECarrierType>())
+        {
+            var underground = level.GetUnderground(position, carrier);
+            if (underground.IsPresent && (underground.Amount <= 0 || underground.Intensity <= 0))
+                return false;
+        }
+
+        return true;
     }
 
-    private static bool MatchesId(ReactorBinding reactor, int reactorId)
+    private static int ProducingConsumerCount(LevelState level, ECarrierType carrier)
     {
-        return reactorId <= 0 || reactor.ReactorId == reactorId;
+        return LevelTraversal.AllPositions(level)
+                             .Count(position => level.GetProp(position) is { Type: EPropType.Consumer } prop && prop.ServiceStateFor(carrier) == EConsumerServiceState.Producing);
+    }
+
+    private static bool HasRequiredConsumers(LevelState level)
+    {
+        return ProducingConsumerCount(level, ECarrierType.Fuel) >= level.RequiredFuelConsumers
+            && ProducingConsumerCount(level, ECarrierType.Coolant) >= level.RequiredCoolantConsumers
+            && ProducingConsumerCount(level, ECarrierType.Electricity) >= level.RequiredElectricityConsumers;
+    }
+
+    private static bool HasConsumerTrouble(PropState prop)
+    {
+        return prop.FuelServiceState is EConsumerServiceState.Starved or EConsumerServiceState.Disabled
+            || prop.CoolantServiceState is EConsumerServiceState.Starved or EConsumerServiceState.Disabled
+            || prop.ElectricityServiceState is EConsumerServiceState.Starved or EConsumerServiceState.Disabled;
     }
 
     private static LevelState Refuse(LevelState level, string message)

src/ReactorMaintenance.Simulation/Systems/RuleEventSystem.cs

@@ -1,73 +0,0 @@
-namespace ReactorMaintenance.Simulation;
-
-internal static class RuleEventSystem
-{
-    public static LevelState Apply(LevelState level, ERuleEventPhase phase)
-    {
-        var next = level;
-        var events = level.RuleEvents.Select((ruleEvent, index) => (Event: ruleEvent, Index: index)).Where(item => item.Event.Enabled && item.Event.Phase == phase && (item.Event.Repeat || !item.Event.Triggered)).OrderBy(item => item.Event.Priority).ToArray();
-        var ruleEvents = next.RuleEvents.ToArray();
-
-        foreach (var item in events)
-        {
-            if (!item.Event.Predicates.All(predicate => PredicateMatches(next, predicate)))
-                continue;
-
-            foreach (var effect in item.Event.Effects)
-                next = ApplyEffect(next, effect);
-
-            ruleEvents[item.Index] = item.Event with { Triggered = true };
-        }
-
-        return next with { RuleEvents = ruleEvents };
-    }
-
-    public static bool PredicateMatches(LevelState level, RulePredicate predicate)
-    {
-        return predicate.Kind switch {
-            ERulePredicateKind.TurnAtLeast => level.Global.Turn >= predicate.Turn,
-            ERulePredicateKind.LevelStateIs => level.Global.LevelState == predicate.LevelState,
-            ERulePredicateKind.ReactorReadyIs => ReactorSystem.MatchesReady(level, predicate),
-            ERulePredicateKind.ReactorLostIs => level.Global.LevelState == ELevelState.Lost == predicate.BoolValue,
-            ERulePredicateKind.ReactorWonIs => ReactorSystem.MatchesWon(level, predicate),
-            ERulePredicateKind.PropStateAt => level.InBounds(predicate.Position) && level.GetProp(predicate.Position).SwitchState == predicate.PropSwitchState,
-            ERulePredicateKind.ConsumerStateAt => level.InBounds(predicate.Position) && level.GetProp(predicate.Position).ServiceState == predicate.ConsumerServiceState,
-            ERulePredicateKind.NetworkBandAt => level.InBounds(predicate.Position) && SimulationBands.NetworkBand(level.GetUnderground(predicate.Position, predicate.Carrier), predicate.Carrier, predicate.NetworkValue) >= predicate.Band,
-            ERulePredicateKind.SurfaceBandAt => level.InBounds(predicate.Position) && SimulationBands.SurfaceBand(level.GetSurface(predicate.Position), predicate.Carrier) >= predicate.Band,
-            ERulePredicateKind.RobotAt => level.Robot.Position == predicate.Position,
-            ERulePredicateKind.RobotInventoryAtLeast => level.Robot.Count(predicate.Remedy) >= predicate.InventoryCount,
-            ERulePredicateKind.AllSeeingEyeUnlocked => level.Global.AllSeeingEyeUnlocked == predicate.BoolValue,
-            _ => false
-        };
-    }
-
-    private static LevelState ApplyEffect(LevelState level, RuleEffect effect)
-    {
-        return effect.Kind switch {
-            ERuleEffectKind.StartLeak => StartLeak(level, effect),
-            ERuleEffectKind.WorsenLeak => level.SetUnderground(effect.Position, effect.Carrier, level.GetUnderground(effect.Position, effect.Carrier) with { State = EUndergroundState.Leaking }),
-            ERuleEffectKind.RepairNetworkCell => level.SetUnderground(effect.Position, effect.Carrier, level.GetUnderground(effect.Position, effect.Carrier) with { State = EUndergroundState.Intact }),
-            ERuleEffectKind.DisableNetworkCell => level.SetUnderground(effect.Position, effect.Carrier, new()),
-            ERuleEffectKind.SetPropEnabled => level.SetProp(effect.Position, level.GetProp(effect.Position) with { SwitchState = effect.PropSwitchState }),
-            ERuleEffectKind.AddSurfaceHazard => level.SetSurface(effect.Position, SurfaceCarrierMath.AddCarrier(level.GetSurface(effect.Position), effect.Carrier, effect.Amount)),
-            ERuleEffectKind.RemoveSurfaceHazard => level.SetSurface(effect.Position, SurfaceCarrierMath.AddCarrier(level.GetSurface(effect.Position), effect.Carrier, -effect.Amount)),
-            ERuleEffectKind.AddHeat => level.SetSurface(effect.Position, level.GetSurface(effect.Position) with { Heat = level.GetSurface(effect.Position).Heat + effect.Amount }),
-            ERuleEffectKind.RemoveHeat => level.SetSurface(effect.Position, level.GetSurface(effect.Position) with { Heat = level.GetSurface(effect.Position).Heat - effect.Amount }),
-            ERuleEffectKind.AddInventory => level with { Robot = level.Robot.Add(effect.Remedy, (int)effect.Amount) },
-            ERuleEffectKind.RemoveInventory => level with { Robot = level.Robot.Add(effect.Remedy, -(int)effect.Amount) },
-            ERuleEffectKind.MarkTerminalLoss => level with { Global = level.Global with { LevelState = ELevelState.Lost, TerminalLoss = true, Status = string.IsNullOrWhiteSpace(effect.Message) ? "TERMINAL FAILURE" : effect.Message } },
-            ERuleEffectKind.EmitWarning => level with { Global = level.Global with { Warnings = [.. level.Global.Warnings, effect.Message] } },
-            _ => level
-        };
-    }
-
-    private static LevelState StartLeak(LevelState level, RuleEffect effect)
-    {
-        var leak = new LeakState {
-            Carrier = effect.Carrier,
-            UndergroundPosition = effect.Position,
-            AccessPosition = effect.AccessPosition ?? effect.Position
-        };
-        return level.SetUnderground(effect.Position, effect.Carrier, level.GetUnderground(effect.Position, effect.Carrier) with { State = EUndergroundState.Leaking }) with { Leaks = [.. level.Leaks, leak] };
-    }
-}

src/ReactorMaintenance.Simulation/Systems/StructuralIntegritySystem.cs

@@ -0,0 +1,82 @@
+namespace ReactorMaintenance.Simulation;
+
+internal static class StructuralIntegritySystem
+{
+    public static LevelState Resolve(LevelState level)
+    {
+        foreach (var carrier in Enum.GetValues<ECarrierType>())
+            level = ResolveCarrier(level, carrier);
+
+        return level;
+    }
+
+    private static LevelState ResolveCarrier(LevelState level, ECarrierType carrier)
+    {
+        var layer = level.Layer(carrier).ToArray();
+        var leaks = level.Leaks.ToList();
+
+        foreach (var position in LevelTraversal.AllPositions(level))
+        {
+            var index = level.Index(position);
+            var cell = layer[index];
+            if (!cell.IsPresent)
+                continue;
+
+            var integrity = DegradeIntegrity(cell, carrier);
+            var state = cell.State;
+            if (state != EUndergroundState.Leaking && integrity <= Balancing.Current.StructuralIntegrityLeakThreshold && cell.Intensity > 0)
+            {
+                state = EUndergroundState.Leaking;
+                leaks = UpsertLeak(leaks, level, position, carrier);
+            }
+
+            layer[index] = cell with { State = state, StructuralIntegrity = integrity };
+        }
+
+        var next = carrier switch {
+            ECarrierType.Fuel => level with { Fuel = layer },
+            ECarrierType.Coolant => level with { Coolant = layer },
+            ECarrierType.Electricity => level with { Electricity = layer },
+            _ => throw new ArgumentOutOfRangeException(nameof(carrier), carrier, "Unsupported carrier.")
+        };
+
+        return next with { Leaks = leaks.ToArray() };
+    }
+
+    private static int DegradeIntegrity(UndergroundCell cell, ECarrierType carrier)
+    {
+        if (cell.StructuralIntegrity >= Balancing.Current.MaxStructuralIntegrity && cell.Intensity <= Balancing.Current.StructuralPressureThreshold(carrier))
+            return Balancing.Current.MaxStructuralIntegrity;
+
+        var overPressure = Math.Max(0, cell.Intensity - Balancing.Current.StructuralPressureThreshold(carrier));
+        if (overPressure <= 0 || cell.StructuralIntegrity >= Balancing.Current.MaxStructuralIntegrity)
+            return Math.Clamp(cell.StructuralIntegrity, 0, Balancing.Current.MaxStructuralIntegrity);
+
+        var damage = Math.Max(1, (int)Math.Ceiling(overPressure * Balancing.Current.StructuralIntegrityDamageScale));
+        return Math.Clamp(cell.StructuralIntegrity - damage, 0, Balancing.Current.MaxStructuralIntegrity);
+    }
+
+    private static List<LeakState> UpsertLeak(List<LeakState> leaks, LevelState level, GridPosition position, ECarrierType carrier)
+    {
+        var accessPosition = carrier == ECarrierType.Electricity
+            ? position.Neighbors().FirstOrDefault(level.IsFloor)
+            : position;
+        if (accessPosition is null || !level.IsFloor(accessPosition))
+            return leaks;
+
+        var index = leaks.FindIndex(leak => leak.UndergroundPosition == position && leak.Carrier == carrier);
+        var leakState = new LeakState {
+            Carrier = carrier,
+            UndergroundPosition = position,
+            AccessPosition = accessPosition,
+            Repaired = false
+        };
+
+        if (index >= 0)
+            leaks[index] = leakState;
+        else
+            leaks.Add(leakState);
+
+        return leaks;
+    }
+}

src/ReactorMaintenance.Win2D/EditorImageRegistry.cs

@@ -0,0 +1,64 @@
+using Microsoft.Graphics.Canvas;
+using Microsoft.Graphics.Canvas.UI.Xaml;
+
+namespace ReactorMaintenance.Win2D;
+
+public sealed class EditorImageRegistry
+{
+    public async Task LoadAsync(CanvasControl sender)
+    {
+        m_Images.Clear();
+        await LoadFolderAsync(sender, "Images", "Props");
+        await LoadFolderAsync(sender, "Images", "Pipes");
+        await LoadFolderAsync(sender, "Images", "Badges");
+        await LoadFolderAsync(sender, "Images", "Elements");
+        AddAlias("tool-floor", "floor");
+        AddAlias("tool-wall", "wall");
+        AddAlias("tool-heat", "heat");
+        AddAlias("tool-robot", "robot");
+        AddAlias("robot", "robot");
+        AddAlias("prop-reactor", "reactor");
+        AddAlias("prop-consumer", "generator");
+        AddAlias("prop-flow", "generator");
+        AddAlias("carrier-fuel-source", "generator");
+        AddAlias("carrier-coolant-source", "cooling-pump");
+        AddAlias("carrier-electricity-source", "generator");
+        AddAlias("prop-junction", "pressure-regulator");
+        AddAlias("prop-door", "wall");
+        AddAlias("prop-eye-terminal", "diagnostic-terminal");
+        AddAlias("prop-remedy", "repair");
+        AddAlias("leak-fuel", "leak");
+        AddAlias("leak-coolant", "leak");
+        AddAlias("leak-electricity", "leak");
+        AddAlias("hazard-heat", "heat");
+        AddAlias("hazard-fuel", "fire");
+        AddAlias("hazard-coolant", "leak");
+        AddAlias("hazard-electricity", "heat");
+    }
+
+    public CanvasBitmap? Get(string key)
+    {
+        return m_Images.GetValueOrDefault(key);
+    }
+
+    private async Task LoadFolderAsync(CanvasControl sender, params string[] pathParts)
+    {
+        var folder = Path.Combine([AppContext.BaseDirectory, .. pathParts]);
+        if (!Directory.Exists(folder))
+            return;
+
+        foreach (var path in Directory.EnumerateFiles(folder, "*.png"))
+        {
+            var key = Path.GetFileNameWithoutExtension(path);
+            m_Images[key] = await CanvasBitmap.LoadAsync(sender, path);
+        }
+    }
+
+    private void AddAlias(string alias, string key)
+    {
+        if (!m_Images.ContainsKey(alias) && m_Images.TryGetValue(key, out var image))
+            m_Images[alias] = image;
+    }
+
+    private readonly Dictionary<string, CanvasBitmap> m_Images = new(StringComparer.OrdinalIgnoreCase);
+}

src/ReactorMaintenance.Win2D/MainWindow.xaml

@@ -15,7 +15,8 @@
             <AppBarButton Icon="OpenFile" Label="Open" Click="Open_Click" />
             <AppBarButton Icon="Save" Label="Save" Click="Save_Click" />
             <AppBarSeparator />
-            <AppBarButton Icon="Play" Label="End Turn" Click="EndTurn_Click" />
+            <AppBarButton x:Name="PlayPauseButton" Icon="Play" Label="Play" Click="PlayPause_Click" />
+            <AppBarButton Icon="Forward" Label="End Turn" Click="EndTurn_Click" />
             <AppBarButton Label="Interact" Click="Interact_Click" />
             <AppBarButton Label="Heat Shield" Click="HeatShield_Click" />
             <AppBarButton Icon="Accept" Label="Activate" Click="Activate_Click" />
@@ -30,6 +31,10 @@
 
             <ScrollViewer Grid.Column="0" Background="#1C2126">
                 <StackPanel Padding="12" Spacing="10">
+                    <TextBlock Text="Layer" FontSize="18" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ComboBox x:Name="LayerPicker"
+                              SelectionChanged="LayerPicker_SelectionChanged"
+                              HorizontalAlignment="Stretch" />
                     <TextBlock Text="Tools" FontSize="18" FontWeight="SemiBold" Foreground="#F4F1E8" />
                     <ItemsControl x:Name="ToolPicker">
                         <ItemsControl.ItemsPanel>
@@ -51,10 +56,9 @@
                     </ItemsControl>
                     <TextBlock Text="Left click selects or paints. Right click clears surface prop and hazards."
                                Foreground="#9EA7AE" TextWrapping="Wrap" />
-                    <TextBlock
-                        Text="Door and wall electricity leaks use two clicks: choose the source cell, then the adjacent floor face."
-                        Foreground="#9EA7AE"
-                        TextWrapping="Wrap" />
+                    <TextBlock Text="Shift+left drag pans. Cursor drag moves the robot or a prop."
+                               Foreground="#9EA7AE"
+                               TextWrapping="Wrap" />
                 </StackPanel>
             </ScrollViewer>
 
@@ -90,42 +94,193 @@
                         </StackPanel>
                     </Grid>
 
-                    <TextBlock Text="Global Systems" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
-                    <TextBlock x:Name="GlobalText" Foreground="#CCD4DA" TextWrapping="Wrap" />
+                    <TextBlock Text="Inventory" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="InventoryGrid">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <StackPanel Orientation="Horizontal" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid MinWidth="55" Margin="0,0,4,0">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto" />
+                                        <RowDefinition Height="Auto" />
+                                    </Grid.RowDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#9EA7AE" FontSize="11" />
+                                    <TextBlock Grid.Row="1" Text="{Binding Value}" Foreground="#F4F1E8" FontSize="18" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
 
-                    <TextBlock Text="Selected Cell" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
-                    <TextBlock x:Name="CellText" Foreground="#CCD4DA" TextWrapping="Wrap" />
+                    <TextBlock Text="Required" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="RequiredGrid">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <StackPanel Orientation="Horizontal" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Width="84" Margin="0,0,4,0">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto" />
+                                        <RowDefinition Height="Auto" />
+                                    </Grid.RowDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#9EA7AE" FontSize="11" />
+                                    <TextBlock Grid.Row="1" Text="{Binding Value}" Foreground="#F4F1E8"
+                                               FontSize="18" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
 
-                    <TextBlock Text="Editor Workflow" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
-                    <TextBlock x:Name="WorkflowText" Foreground="#CCD4DA" TextWrapping="Wrap" />
-
-                    <TextBlock Text="Reactor Binding" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
-                    <TextBlock x:Name="ReactorBindingText" Foreground="#CCD4DA" TextWrapping="Wrap" />
-                    <Grid ColumnSpacing="8" RowSpacing="8">
+                    <TextBlock x:Name="HoveredCellText" Text="Hovered Cell:" FontSize="16" FontWeight="SemiBold"
+                               Foreground="#F4F1E8" />
+                    <TextBlock x:Name="SelectedCellText" Text="Selected Cell:" FontSize="16" FontWeight="SemiBold"
+                               Foreground="#F4F1E8" />
+                    <Grid>
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="Auto" />
+                            <RowDefinition Height="Auto" />
+                        </Grid.RowDefinitions>
                         <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                            <ColumnDefinition />
                         </Grid.ColumnDefinitions>
-                        <Button Content="Fuel" Click="BindFuel_Click" HorizontalAlignment="Stretch" />
-                        <Button Grid.Column="1" Content="Coolant" Click="BindCoolant_Click"
-                                HorizontalAlignment="Stretch" />
-                        <Button Grid.Column="2" Content="Electric" Click="BindElectricity_Click"
-                                HorizontalAlignment="Stretch" />
+                        <TextBlock Grid.Column="0" Grid.Row="0" Text="Terrain" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="0" Grid.Row="1" x:Name="TerrainText" Foreground="#F4F1E8" FontSize="16"
+                                   Margin="0,0,10,0" />
+                        <TextBlock Grid.Column="1" Grid.Row="0" Text="Prop" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="1" Grid.Row="1" x:Name="PropText" Foreground="#F4F1E8" FontSize="16" />
                     </Grid>
 
-                    <TextBlock Text="Rule Events" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
-                    <TextBlock x:Name="RuleEventText" Foreground="#CCD4DA" TextWrapping="Wrap" />
-                    <Grid ColumnSpacing="8" RowSpacing="8">
+                    <TextBlock Text="Consumers:" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="ConsumersGrid">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <StackPanel Orientation="Horizontal" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Width="96" Margin="0,0,4,0">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto" />
+                                        <RowDefinition Height="Auto" />
+                                    </Grid.RowDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#9EA7AE" FontSize="11"
+                                               TextWrapping="NoWrap" />
+                                    <TextBlock Grid.Row="1" Text="{Binding Value}" Foreground="#F4F1E8" FontSize="16" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+
+                    <TextBlock Text="Services:" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="ServicesGrid">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <StackPanel Orientation="Horizontal" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Width="96" Margin="0,0,4,0">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto" />
+                                        <RowDefinition Height="Auto" />
+                                    </Grid.RowDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#9EA7AE" FontSize="11"
+                                               TextWrapping="NoWrap" />
+                                    <TextBlock Grid.Row="1" Text="{Binding Value}" Foreground="#F4F1E8" FontSize="16" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+
+                    <TextBlock Text="Leaks:" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="LeaksGrid">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Margin="0,0,4,0">
+                                    <Grid.ColumnDefinitions>
+                                        <ColumnDefinition Width="Auto" />
+                                        <ColumnDefinition />
+                                    </Grid.ColumnDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#F4F1E8" FontSize="16"
+                                               Margin="0,0,10,0" />
+                                    <TextBlock Grid.Column="1" Text="{Binding Value}" Foreground="#F4F1E8"
+                                               FontSize="16" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+
+                    <TextBlock Text="Surface" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <ItemsControl x:Name="SurfaceGrid">
+                        <ItemsControl.ItemsPanel>
+                            <ItemsPanelTemplate>
+                                <StackPanel Orientation="Horizontal" />
+                            </ItemsPanelTemplate>
+                        </ItemsControl.ItemsPanel>
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Width="64" Margin="0,0,4,0">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto" />
+                                        <RowDefinition Height="Auto" />
+                                    </Grid.RowDefinitions>
+                                    <TextBlock Text="{Binding Label}" Foreground="#9EA7AE" FontSize="11"
+                                               TextWrapping="NoWrap" />
+                                    <TextBlock Grid.Row="1" Text="{Binding Value}" Foreground="#F4F1E8" FontSize="16" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+
+                    <TextBlock Text="Network" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
+                    <Grid ColumnSpacing="6">
                         <Grid.ColumnDefinitions>
-                            <ColumnDefinition Width="*" />
-                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="64" />
+                            <ColumnDefinition Width="60" />
+                            <ColumnDefinition Width="34" />
+                            <ColumnDefinition Width="34" />
+                            <ColumnDefinition Width="34" />
                         </Grid.ColumnDefinitions>
-                        <Button Content="Warn Next Turn" Click="AddWarningRule_Click" HorizontalAlignment="Stretch" />
-                        <Button Grid.Column="1" Content="Leak Next Turn" Click="AddLeakRule_Click"
-                                HorizontalAlignment="Stretch" />
+                        <TextBlock Text="Carrier" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="1" Text="State" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="2" Text="Amt" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="3" Text="Int" Foreground="#9EA7AE" FontSize="11" />
+                        <TextBlock Grid.Column="4" Text="HP" Foreground="#9EA7AE" FontSize="11" />
                     </Grid>
-                    <Button Content="Remove Last Rule" Click="RemoveLastRule_Click" HorizontalAlignment="Stretch" />
+                    <ItemsControl x:Name="NetworkGrid">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Grid Margin="0,0,0,8" ColumnSpacing="6">
+                                    <Grid.ColumnDefinitions>
+                                        <ColumnDefinition Width="64" />
+                                        <ColumnDefinition Width="60" />
+                                        <ColumnDefinition Width="34" />
+                                        <ColumnDefinition Width="34" />
+                                        <ColumnDefinition Width="34" />
+                                    </Grid.ColumnDefinitions>
+                                    <TextBlock Text="{Binding Carrier}" Foreground="#F4F1E8" FontSize="12"
+                                               TextWrapping="Wrap" />
+                                    <TextBlock Grid.Column="1" Text="{Binding State}" Foreground="#9EA7AE"
+                                               FontSize="12" TextWrapping="Wrap" />
+                                    <TextBlock Grid.Column="2" Text="{Binding Amount}" Foreground="#F4F1E8"
+                                               FontSize="12" />
+                                    <TextBlock Grid.Column="3" Text="{Binding Intensity}" Foreground="#F4F1E8"
+                                               FontSize="12" />
+                                    <TextBlock Grid.Column="4" Text="{Binding Integrity}" Foreground="#F4F1E8"
+                                               FontSize="12" />
+                                </Grid>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
 
                     <TextBlock Text="Forecasts" FontSize="16" FontWeight="SemiBold" Foreground="#F4F1E8" />
                     <ItemsControl x:Name="ForecastList">

tests/ReactorMaintenance.Simulation.Tests/LevelEditorTests.cs

@@ -3,18 +3,71 @@
 public sealed class LevelEditorTests
 {
     [Fact]
-    public void DoorToolRequiresExplicitAdjacentEdgeSelection()
+    public void DoorToolPlacesSingleFloorDoorProp()
     {
         var level = LevelState.Create("Door editor", 6, 6);
 
-        var withDoorProp = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });
-        var withDoorEdge = LevelEditor.SetDoorEdge(withDoorProp, new(2, 2), new(3, 2));
-        var rejected = LevelEditor.SetDoorEdge(withDoorEdge, new(2, 2), new(4, 2));
+        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });
 
-        Assert.Equal(EPropType.Door, withDoorProp.GetProp(new(2, 2)).Type);
-        Assert.Empty(withDoorProp.Doors);
-        Assert.Single(withDoorEdge.Doors);
-        Assert.Equal(withDoorEdge.Doors, rejected.Doors);
+        Assert.Equal(EPropType.Door, next.GetProp(new(2, 2)).Type);
+        Assert.Equal(EDoorState.Closed, next.GetProp(new(2, 2)).DoorState);
+    }
+
+    [Fact]
+    public void DoorToolTogglesExistingDoorState()
+    {
+        var level = LevelState.Create("Door editor", 6, 6);
+        level = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });
+
+        var opened = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Door });
+        var closed = LevelEditor.Apply(opened, new(2, 2), new() { Tool = EEditorTool.Door });
+
+        Assert.Equal(EDoorState.Open, opened.GetProp(new(2, 2)).DoorState);
+        Assert.Equal(EDoorState.Closed, closed.GetProp(new(2, 2)).DoorState);
+    }
+
+    [Fact]
+    public void WallToolPreservesUndergroundNetworks()
+    {
+        var level = LevelState.Create("Wall editor", 6, 6);
+        var position = new GridPosition(2, 2);
+        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Fuel });
+        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Coolant });
+        level = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Electricity });
+
+        var next = LevelEditor.Apply(level, position, new() { Tool = EEditorTool.Wall });
+
+        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Fuel).State);
+        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Coolant).State);
+        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(position, ECarrierType.Electricity).State);
+    }
+
+    [Fact]
+    public void UndergroundToolCanPaintAdjacentCellsRepeatedly()
+    {
+        var level = LevelState.Create("Network editor", 6, 6);
+        var command = new EditorToolCommand { Tool = EEditorTool.Underground, Carrier = ECarrierType.Fuel };
+
+        level = LevelEditor.Apply(level, new(1, 1), command);
+        level = LevelEditor.Apply(level, new(2, 1), command);
+        level = LevelEditor.Apply(level, new(3, 1), command);
+
+        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(1, 1), ECarrierType.Fuel).State);
+        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(2, 1), ECarrierType.Fuel).State);
+        Assert.Equal(EUndergroundState.Intact, level.GetUnderground(new(3, 1), ECarrierType.Fuel).State);
+    }
+
+    [Fact]
+    public void ConsumerToolPlacesCarrierAgnosticConsumer()
+    {
+        var level = LevelState.Create("Consumer editor", 6, 6);
+
+        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Consumer, Carrier = ECarrierType.Fuel });
+
+        Assert.Equal(EPropType.Consumer, next.GetProp(new(2, 2)).Type);
+        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).FuelServiceState);
+        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).CoolantServiceState);
+        Assert.Equal(EConsumerServiceState.Unknown, next.GetProp(new(2, 2)).ElectricityServiceState);
     }
 
     [Fact]
@@ -33,44 +86,116 @@ public sealed class LevelEditorTests
     }
 
     [Fact]
-    public void ReactorBindingUpdatesOnlyMatchingCarrierConsumer()
+    public void ElectricityLeakAccessCyclesAcrossAdjacentFloorFaces()
     {
-        var level = LevelState.Create("Binding editor", 8, 6);
-        level = level.SetProp(new(1, 1), new() { Type = EPropType.ReactorControl, ReactorId = 1 });
-        level = level.SetProp(new(2, 1), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Fuel });
-        level = level.SetProp(new(3, 1), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Coolant }) with {
-            Reactors = [
-                new() {
-                    ReactorId = 1,
-                    ControlPosition = new(1, 1),
-                    FuelConsumerPosition = new(1, 1),
-                    CoolantConsumerPosition = new(1, 1),
-                    ElectricityConsumerPosition = new(1, 1)
-                }
-            ]
-        };
+        var level = LevelState.Create("Electricity leak editor", 6, 6);
+        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
+        level = level.SetTerrain(new(2, 1), ECellTerrain.Wall);
+        level = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.Underground, Carrier = ECarrierType.Electricity });
 
-        var bound = LevelEditor.BindReactorConsumer(level, 1, ECarrierType.Fuel, new(2, 1));
-        var rejected = LevelEditor.BindReactorConsumer(bound, 1, ECarrierType.Fuel, new(3, 1));
+        var first = LevelEditor.CycleElectricityLeakAccess(level, new(2, 2));
+        var second = LevelEditor.CycleElectricityLeakAccess(first, new(2, 2));
 
-        Assert.Equal(new(2, 1), bound.Reactors[0].FuelConsumerPosition);
-        Assert.Equal(bound.Reactors[0].FuelConsumerPosition, rejected.Reactors[0].FuelConsumerPosition);
+        Assert.Single(first.Leaks);
+        Assert.Equal(new(3, 2), first.Leaks[0].AccessPosition);
+        Assert.Single(second.Leaks);
+        Assert.Equal(new(2, 3), second.Leaks[0].AccessPosition);
     }
 
     [Fact]
-    public void RuleEventEditorAssignsStableIdsAndCanRemoveEvents()
+    public void ReactorControlToolCreatesUnboundReactorState()
     {
-        var level = LevelState.Create("Rule editor", 6, 6);
+        var level = LevelState.Create("Reactor editor", 6, 6);
 
-        var withRule = LevelEditor.AddRuleEvent(level, new() {
-            Phase = ERuleEventPhase.EndOfTurn,
-            Predicates = [new() { Kind = ERulePredicateKind.TurnAtLeast, Turn = 1 }],
-            Effects = [new() { Kind = ERuleEffectKind.EmitWarning, Message = "authored" }]
-        });
-        var removed = LevelEditor.RemoveRuleEvent(withRule, "rule-1");
+        var next = LevelEditor.Apply(level, new(2, 2), new() { Tool = EEditorTool.ReactorControl });
 
-        Assert.Single(withRule.RuleEvents);
-        Assert.Equal("rule-1", withRule.RuleEvents[0].Id);
-        Assert.Empty(removed.RuleEvents);
+        Assert.Single(next.Reactors);
+        Assert.Equal(new(2, 2), next.Reactors[0].ControlPosition);
+        Assert.Equal(1, next.Reactors[0].ReactorId);
+    }
+
+    [Fact]
+    public void MoveOccupantMovesRobotToFloorDestination()
+    {
+        var level = LevelState.Create("Move editor", 6, 6) with { Robot = new() { Position = new(1, 1) } };
+
+        var next = LevelEditor.MoveOccupant(level, new(1, 1), new(3, 3));
+
+        Assert.Equal(new(3, 3), next.Robot.Position);
+    }
+
+    [Fact]
+    public void MoveOccupantMovesPropAndUpdatesReactorControlPosition()
+    {
+        var level = LevelState.Create("Move editor", 6, 6);
+        level = LevelEditor.Apply(level, new(1, 1), new() { Tool = EEditorTool.ReactorControl });
+
+        var next = LevelEditor.MoveOccupant(level, new(1, 1), new(3, 3));
+
+        Assert.Equal(EPropType.None, next.GetProp(new(1, 1)).Type);
+        Assert.Equal(EPropType.ReactorControl, next.GetProp(new(3, 3)).Type);
+        Assert.Equal(new(3, 3), next.Reactors[0].ControlPosition);
+    }
+
+    [Fact]
+    public void MoveOccupantMovesSourcesAsProps()
+    {
+        var level = LevelState.Create("Move editor", 6, 6);
+        level = LevelEditor.Apply(level, new(1, 1), new() { Tool = EEditorTool.Flow, Carrier = ECarrierType.Fuel });
+
+        var result = LevelEditor.TryMoveOccupant(level, new(1, 1), new(3, 3));
+
+        Assert.True(result.Success, result.Reason);
+        Assert.Equal(EPropType.None, result.Level.GetProp(new(1, 1)).Type);
+        Assert.Equal(EPropType.Flow, result.Level.GetProp(new(3, 3)).Type);
+        Assert.Equal(ECarrierType.Fuel, result.Level.GetProp(new(3, 3)).Carrier);
+    }
+
+    [Fact]
+    public void MoveOccupantMovesFuelLeakToFloorDestination()
+    {
+        var level = LevelState.Create("Move editor", 6, 6);
+        level = LevelEditor.SetLeak(level, new(1, 1), new(1, 1), ECarrierType.Fuel);
+
+        var result = LevelEditor.TryMoveOccupant(level, new(1, 1), new(3, 3));
+
+        Assert.True(result.Success, result.Reason);
+        Assert.Single(result.Level.Leaks);
+        Assert.Equal(new(3, 3), result.Level.Leaks[0].UndergroundPosition);
+        Assert.Equal(new(3, 3), result.Level.Leaks[0].AccessPosition);
+        Assert.Equal(EUndergroundState.Leaking, result.Level.GetUnderground(new(3, 3), ECarrierType.Fuel).State);
+        Assert.Equal(EUndergroundState.Absent, result.Level.GetUnderground(new(1, 1), ECarrierType.Fuel).State);
+    }
+
+    [Fact]
+    public void MoveOccupantMovesElectricityLeakAccessFace()
+    {
+        var level = LevelState.Create("Move editor", 6, 6);
+        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
+        level = LevelEditor.SetLeak(level, new(2, 2), new(2, 3), ECarrierType.Electricity);
+
+        var result = LevelEditor.TryMoveOccupant(level, new(2, 3), new(3, 2));
+
+        Assert.True(result.Success, result.Reason);
+        Assert.Single(result.Level.Leaks);
+        Assert.Equal(new(2, 2), result.Level.Leaks[0].UndergroundPosition);
+        Assert.Equal(new(3, 2), result.Level.Leaks[0].AccessPosition);
+    }
+
+    [Fact]
+    public void MoveOccupantReportsInvalidStartAndDestinationReasons()
+    {
+        var level = LevelState.Create("Move editor", 6, 6);
+        level = level.SetTerrain(new(3, 3), ECellTerrain.Wall);
+        level = level.SetProp(new(1, 1), new() { Type = EPropType.Consumer });
+        level = level.SetProp(new(2, 2), new() { Type = EPropType.Consumer });
+
+        var invalidStart = LevelEditor.TryMoveOccupant(level, new(4, 4), new(5, 5));
+        var invalidDestination = LevelEditor.TryMoveOccupant(level, new(1, 1), new(2, 2));
+
+        Assert.False(invalidStart.Success);
+        Assert.Contains("No movable", invalidStart.Reason);
+        Assert.False(invalidDestination.Success);
+        Assert.Contains("occupied", invalidDestination.Reason);
     }
 }

tests/ReactorMaintenance.Simulation.Tests/SimulationEngineTests.cs

@@ -3,19 +3,31 @@
 public sealed class SimulationEngineTests
 {
     [Fact]
-    public void NetworkPropagationSuppliesBoundConsumersAndReadiesReactor()
+    public void NetworkPropagationSuppliesConsumerServicesAndReadiesReactor()
     {
         var level = BuildReadyLevel();
 
         var next = m_Engine.AdvanceTurn(level);
+        var consumer = next.GetProp(new(3, 3));
 
-        Assert.Equal(EConsumerServiceState.Producing, next.GetProp(new(3, 2)).ServiceState);
-        Assert.Equal(EConsumerServiceState.Producing, next.GetProp(new(3, 3)).ServiceState);
-        Assert.Equal(EConsumerServiceState.Producing, next.GetProp(new(3, 4)).ServiceState);
+        Assert.Equal(EConsumerServiceState.Producing, consumer.FuelServiceState);
+        Assert.Equal(EConsumerServiceState.Producing, consumer.CoolantServiceState);
+        Assert.Equal(EConsumerServiceState.Producing, consumer.ElectricityServiceState);
         Assert.Equal(ELevelState.Ready, next.Global.LevelState);
         Assert.Contains(next.Forecasts, forecast => forecast.Kind == EForecastKind.ReactorReady);
     }
 
+    [Fact]
+    public void ReactorNeedsPositiveFlowOnlyForNetworksBeneathControl()
+    {
+        var level = BuildReadyLevel();
+        level = level.SetUnderground(new(5, 3), ECarrierType.Fuel, new() { State = EUndergroundState.Intact });
+
+        var next = m_Engine.AdvanceTurn(level);
+
+        Assert.NotEqual(ELevelState.Ready, next.Global.LevelState);
+    }
+
     [Fact]
     public void ReactorActivatesOnlyAtReadyControl()
     {
@@ -30,19 +42,110 @@ public sealed class SimulationEngineTests
     }
 
     [Fact]
-    public void LeakingUndergroundCellInjectsMatchingSurfaceHazard()
+    public void DisabledConsumerReportsDisabledOnlyForNetworksBeneathIt()
     {
-        var level = LevelState.Create("Leak", 6, 6);
-        level = level.SetUnderground(new(2, 2), ECarrierType.Fuel, new() { State = EUndergroundState.Leaking, Amount = 5, Intensity = 5 }) with {
-            Leaks = [new() { Carrier = ECarrierType.Fuel, UndergroundPosition = new(2, 2), AccessPosition = new(2, 2) }]
+        var level = LevelState.Create("Disabled", 6, 6);
+        level = level.SetUnderground(new(2, 2), ECarrierType.Fuel, new() { State = EUndergroundState.Intact });
+        level = level.SetProp(new(2, 2), new() { Type = EPropType.Consumer, SwitchState = EPropSwitchState.Disabled });
+
+        var next = m_Engine.AdvanceTurn(level);
+        var consumer = next.GetProp(new(2, 2));
+
+        Assert.Equal(EConsumerServiceState.Disabled, consumer.FuelServiceState);
+        Assert.Equal(EConsumerServiceState.Unknown, consumer.CoolantServiceState);
+        Assert.Equal(EConsumerServiceState.Unknown, consumer.ElectricityServiceState);
+        Assert.Equal(EConsumerServiceState.Disabled, consumer.ServiceState);
+    }
+
+    [Fact]
+    public void MovementIsQuickAndDoesNotResolveSimulationStep()
+    {
+        var level = LevelState.Create("Quick", 6, 6) with {
+            Robot = new() { Position = new(1, 1) }
         };
-        level = level.SetProp(new(2, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
+
+        var next = m_Engine.MoveRobot(level, new(2, 1));
+
+        Assert.Equal(new(2, 1), next.Robot.Position);
+        Assert.Equal(0, next.Global.Turn);
+    }
+
+    [Fact]
+    public void DoorInteractionIsLengthyAndResolvesSimulationStep()
+    {
+        var level = DoorLevel();
+        level = level with { Robot = new() { Position = new(3, 2) } };
+
+        var next = m_Engine.InteractProp(level);
+
+        Assert.Equal(EDoorState.Open, next.GetProp(new(3, 2)).DoorState);
+        Assert.Equal(1, next.Global.Turn);
+    }
+
+    [Fact]
+    public void ClosedInferredDoorBlocksAdjacentHeatFlow()
+    {
+        var level = DoorLevel();
+        level = level.SetSurface(new(3, 2), new() { Heat = 8 });
 
         var next = m_Engine.AdvanceTurn(level);
 
+        Assert.Equal(0, next.GetSurface(new(4, 2)).Heat);
+    }
+
+    [Fact]
+    public void StructuralIntegrityCreatesLeakWhenWeakCellHasPositivePressure()
+    {
+        var level = LevelState.Create("Integrity leak", 6, 6);
+        level = AddLine(level, ECarrierType.Fuel, new(1, 2), new(2, 2));
+        level = level.SetProp(new(1, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
+        level = level.SetUnderground(new(2, 2), ECarrierType.Fuel, level.GetUnderground(new(2, 2), ECarrierType.Fuel) with {
+            StructuralIntegrity = Balancing.Current.StructuralIntegrityLeakThreshold
+        });
+
+        var next = m_Engine.AdvanceTurn(level);
+
+        Assert.Equal(EUndergroundState.Leaking, next.GetUnderground(new(2, 2), ECarrierType.Fuel).State);
+        Assert.Contains(next.Leaks, leak => leak.Carrier == ECarrierType.Fuel && leak.UndergroundPosition == new GridPosition(2, 2));
         Assert.True(next.GetSurface(new(2, 2)).Fuel > 0);
     }
 
+    [Fact]
+    public void HighPressureWorsensNonMaxStructuralIntegrity()
+    {
+        var level = LevelState.Create("Integrity damage", 6, 6);
+        level = AddLine(level, ECarrierType.Fuel, new(1, 2), new(2, 2));
+        level = level.SetProp(new(1, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
+        level = level.SetUnderground(new(2, 2), ECarrierType.Fuel, level.GetUnderground(new(2, 2), ECarrierType.Fuel) with {
+            StructuralIntegrity = Balancing.Current.MaxStructuralIntegrity - 1
+        });
+
+        var next = m_Engine.AdvanceTurn(level);
+
+        Assert.True(next.GetUnderground(new(2, 2), ECarrierType.Fuel).StructuralIntegrity < Balancing.Current.MaxStructuralIntegrity - 1);
+    }
+
+    [Fact]
+    public void RepairingLeakRestoresStructuralIntegrity()
+    {
+        var level = LevelState.Create("Repair", 6, 6);
+        level = level.SetUnderground(new(2, 2), ECarrierType.Fuel, new() {
+            State = EUndergroundState.Leaking,
+            Amount = 5,
+            Intensity = 5,
+            StructuralIntegrity = 0
+        }) with {
+            Robot = new() { Position = new(2, 2) },
+            Leaks = [new() { Carrier = ECarrierType.Fuel, UndergroundPosition = new(2, 2), AccessPosition = new(2, 2) }]
+        };
+
+        var next = m_Engine.InteractLeak(level, ECarrierType.Fuel, false);
+
+        Assert.True(next.Leaks[0].Repaired);
+        Assert.Equal(EUndergroundState.Intact, next.GetUnderground(new(2, 2), ECarrierType.Fuel).State);
+        Assert.Equal(Balancing.Current.MaxStructuralIntegrity, next.GetUnderground(new(2, 2), ECarrierType.Fuel).StructuralIntegrity);
+    }
+
     [Fact]
     public void ElementRemedyClearsHazardAndBlocksImmediateReentry()
     {
@@ -60,19 +163,6 @@ public sealed class SimulationEngineTests
         Assert.Equal(0, next.Robot.FuelNeutralizers);
     }
 
-    [Fact]
-    public void ClosedDoorBlocksAdjacentHeatFlow()
-    {
-        var level = LevelState.Create("Door", 6, 6);
-        level = level.SetSurface(new(2, 2), new() { Heat = 8 }) with {
-            Doors = [new() { A = new(2, 2), B = new(3, 2), State = EDoorState.Closed }]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Equal(0, next.GetSurface(new(3, 2)).Heat);
-    }
-
     [Fact]
     public void HeatShieldPreventsRobotHeatLoss()
     {
@@ -122,217 +212,19 @@ public sealed class SimulationEngineTests
     }
 
     [Fact]
-    public void ValidatorRejectsJunctionWithoutTwoOrThreeOutflows()
-    {
-        var level = BuildJunctionLevel(2);
-        level = level.SetUnderground(new(3, 3), ECarrierType.Fuel, new());
-
-        var report = new LevelValidator().Validate(level);
-
-        Assert.False(report.IsValid);
-        Assert.Contains(report.Errors, error => error.Message.Contains("one incoming branch and two or three outgoing branches", StringComparison.Ordinal));
-    }
-
-    [Fact]
-    public void NonJunctionCellsAcceptBestFlowFromMultipleSourcePaths()
-    {
-        var level = LevelState.Create("Best path", 7, 7);
-        level = AddHorizontalUnderground(level, ECarrierType.Fuel, 1, 5, 3);
-        level = level.SetProp(new(1, 3), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
-        level = level.SetProp(new(5, 3), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
-        level = level.SetProp(new(3, 3), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Fuel });
-
-        var report = new LevelValidator().Validate(level);
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.True(report.IsValid);
-        Assert.Equal(EConsumerServiceState.Producing, next.GetProp(new(3, 3)).ServiceState);
-    }
-
-    [Fact]
-    public void RobotLosesOnUnsafeElementHazard()
-    {
-        var level = LevelState.Create("Unsafe", 6, 6);
-        level = level.SetSurface(new(2, 2), new() { Electricity = Balancing.Current.MaxValue }) with {
-            Robot = new() { Position = new(2, 2) }
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Equal(ELevelState.Lost, next.Global.LevelState);
-    }
-
-    [Fact]
-    public void RuleEventCanCreateTerminalLossForecast()
-    {
-        var level = LevelState.Create("Rule", 6, 6) with {
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.EndOfTurn,
-                    ForecastText = "containment failure",
-                    Predicates = [new() { Kind = ERulePredicateKind.TurnAtLeast, Turn = 0 }],
-                    Effects = [new() { Kind = ERuleEffectKind.MarkTerminalLoss, Message = "CONTAINMENT FAILURE" }]
-                }
-            ]
-        };
-
-        var forecasts = m_Engine.Forecast(level);
-
-        Assert.Contains(forecasts, forecast => forecast.Kind == EForecastKind.RuleEvent && forecast.Message == "containment failure");
-        Assert.Contains(forecasts, forecast => forecast.Kind == EForecastKind.TerminalLoss);
-    }
-
-    [Fact]
-    public void RuleEventCanTriggerFromNetworkBand()
-    {
-        var level = LevelState.Create("Network rule", 6, 6);
-        level = AddLine(level, ECarrierType.Fuel, new(2, 2), new(3, 2));
-        level = level.SetProp(new(2, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel }) with {
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.EndOfTurn,
-                    Predicates = [new() { Kind = ERulePredicateKind.NetworkBandAt, Position = new(3, 2), Carrier = ECarrierType.Fuel, NetworkValue = ENetworkValueKind.Amount, Band = EBand.Critical }],
-                    Effects = [new() { Kind = ERuleEffectKind.EmitWarning, Message = "fuel pressure high" }]
-                }
-            ]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Contains("fuel pressure high", next.Global.Warnings);
-    }
-
-    [Fact]
-    public void RuleEventCanTriggerFromReactorReadiness()
-    {
-        var level = BuildReadyLevel() with {
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.EndOfTurn,
-                    Predicates = [new() { Kind = ERulePredicateKind.ReactorReadyIs, ReactorId = 1, BoolValue = true }],
-                    Effects = [new() { Kind = ERuleEffectKind.EmitWarning, Message = "reactor ready rule" }]
-                }
-            ]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Contains("reactor ready rule", next.Global.Warnings);
-    }
-
-    [Fact]
-    public void RuleEventCanTriggerFromRobotInventory()
-    {
-        var level = LevelState.Create("Inventory rule", 6, 6) with {
-            Robot = new() { Position = new(1, 1), FuelNeutralizers = 1 },
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.StartOfSimulation,
-                    Predicates = [new() { Kind = ERulePredicateKind.RobotInventoryAtLeast, Remedy = ERemedyType.FuelNeutralizer, InventoryCount = 1 }],
-                    Effects = [new() { Kind = ERuleEffectKind.EmitWarning, Message = "fuel kit detected" }]
-                }
-            ]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Contains("fuel kit detected", next.Global.Warnings);
-    }
-
-    [Fact]
-    public void RuleEventCanRemoveHazardsHeatAndInventory()
-    {
-        var level = LevelState.Create("Remove rule", 6, 6);
-        level = level.SetSurface(new(2, 2), new() { Fuel = 5, Heat = 5 }) with {
-            Robot = new() { Position = new(1, 1), FuelNeutralizers = 2 },
-            Doors = [
-                new() { A = new(2, 2), B = new(1, 2), State = EDoorState.Closed },
-                new() { A = new(2, 2), B = new(3, 2), State = EDoorState.Closed },
-                new() { A = new(2, 2), B = new(2, 1), State = EDoorState.Closed },
-                new() { A = new(2, 2), B = new(2, 3), State = EDoorState.Closed }
-            ],
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.StartOfSimulation,
-                    Predicates = [new() { Kind = ERulePredicateKind.TurnAtLeast, Turn = 0 }],
-                    Effects = [
-                        new() { Kind = ERuleEffectKind.RemoveSurfaceHazard, Position = new(2, 2), Carrier = ECarrierType.Fuel, Amount = 2 },
-                        new() { Kind = ERuleEffectKind.RemoveHeat, Position = new(2, 2), Amount = 3 },
-                        new() { Kind = ERuleEffectKind.RemoveInventory, Remedy = ERemedyType.FuelNeutralizer, Amount = 1 }
-                    ]
-                }
-            ]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Equal(3, next.GetSurface(new(2, 2)).Fuel);
-        Assert.Equal(2, next.GetSurface(new(2, 2)).Heat);
-        Assert.Equal(1, next.Robot.FuelNeutralizers);
-    }
-
-    [Fact]
-    public void RuleEventStartLeakUsesAuthoredElectricityAccessFace()
-    {
-        var level = LevelState.Create("Electricity leak rule", 6, 6);
-        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
-        level = level.SetUnderground(new(2, 2), ECarrierType.Electricity, new() { State = EUndergroundState.Intact }) with {
-            RuleEvents = [
-                new() {
-                    Phase = ERuleEventPhase.StartOfSimulation,
-                    Predicates = [new() { Kind = ERulePredicateKind.TurnAtLeast, Turn = 0 }],
-                    Effects = [new() { Kind = ERuleEffectKind.StartLeak, Position = new(2, 2), AccessPosition = new(2, 3), Carrier = ECarrierType.Electricity }]
-                }
-            ]
-        };
-
-        var next = m_Engine.AdvanceTurn(level);
-
-        Assert.Single(next.Leaks);
-        Assert.Equal(new(2, 3), next.Leaks[0].AccessPosition);
-        Assert.True(next.GetSurface(new(2, 3)).Electricity > 0);
-    }
-
-    [Fact]
-    public void ValidatorRejectsInvalidRuleTargets()
-    {
-        var level = LevelState.Create("Invalid rules", 6, 6);
-        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall) with {
-            RuleEvents = [
-                new() {
-                    Predicates = [new() { Kind = ERulePredicateKind.PropStateAt, Position = new(1, 1) }],
-                    Effects = [
-                        new() { Kind = ERuleEffectKind.AddSurfaceHazard, Position = new(2, 2), Carrier = ECarrierType.Fuel, Amount = 1 },
-                        new() { Kind = ERuleEffectKind.RepairNetworkCell, Position = new(3, 3), Carrier = ECarrierType.Coolant }
-                    ]
-                }
-            ]
-        };
-
-        var report = new LevelValidator().Validate(level);
-
-        Assert.False(report.IsValid);
-        Assert.Contains(report.Errors, error => error.Message.Contains("Rule prop predicate", StringComparison.Ordinal));
-        Assert.Contains(report.Errors, error => error.Message.Contains("Rule surface effect", StringComparison.Ordinal));
-        Assert.Contains(report.Errors, error => error.Message.Contains("Rule network effect", StringComparison.Ordinal));
-    }
-
-    [Fact]
-    public void ValidatorRejectsWallHazardsAndInvalidReactorBinding()
+    public void ValidatorRejectsInvalidDoorGeometryAndWallHazards()
     {
         var level = LevelState.Create("Invalid", 6, 6);
-        level = level.SetTerrain(new(2, 2), ECellTerrain.Wall);
-        level = level with {
-            Surface = level.Surface.ToArray(),
-            Reactors = [new() { ControlPosition = new(3, 3), FuelConsumerPosition = new(1, 1), CoolantConsumerPosition = new(1, 1), ElectricityConsumerPosition = new(1, 1) }]
-        };
-        level.Surface[level.Index(new(2, 2))] = new() { Heat = 1 };
+        level = level.SetProp(new(2, 2), new() { Type = EPropType.Door });
+        level = level.SetTerrain(new(4, 4), ECellTerrain.Wall);
+        level = level with { Surface = level.Surface.ToArray() };
+        level.Surface[level.Index(new(4, 4))] = new() { Heat = 1 };
 
         var report = new LevelValidator().Validate(level);
 
         Assert.False(report.IsValid);
+        Assert.Contains(report.Errors, error => error.Message.Contains("Door must be surrounded", StringComparison.Ordinal));
         Assert.Contains(report.Errors, error => error.Message.Contains("Wall cell", StringComparison.Ordinal));
-        Assert.Contains(report.Errors, error => error.Message.Contains("Reactor binding", StringComparison.Ordinal));
     }
 
     [Fact]
@@ -343,36 +235,27 @@ public sealed class SimulationEngineTests
         var json = LevelSerializer.Serialize(level);
         var loaded = LevelSerializer.Deserialize(json);
 
-        Assert.Contains("\"Version\": 2", json);
+        Assert.Contains("\"Version\": 3", json);
         Assert.Equal(level.Name, loaded.Name);
-        Assert.Equal(EPropType.Flow, loaded.GetProp(new(2, 2)).Type);
+        Assert.Equal(EPropType.Consumer, loaded.GetProp(new(3, 3)).Type);
+        Assert.Equal(level.RequiredFuelConsumers, loaded.RequiredFuelConsumers);
     }
 
     [Fact]
-    public void LevelSerializationRoundTripsRuleEventsDoorsAndElectricityLeakFaces()
+    public void LevelSerializationRoundTripsPropDoorsAndElectricityLeakFaces()
     {
         var level = BuildReadyLevel();
         level = level.SetTerrain(new(6, 4), ECellTerrain.Wall);
         level = level.SetUnderground(new(6, 4), ECarrierType.Electricity, new() { State = EUndergroundState.Leaking }) with {
-            Doors = [new() { A = new(5, 3), B = new(5, 4), State = EDoorState.Closed }],
-            Leaks = [new() { Carrier = ECarrierType.Electricity, UndergroundPosition = new(6, 4), AccessPosition = new(6, 3) }],
-            RuleEvents = [
-                new() {
-                    Id = "authored",
-                    Phase = ERuleEventPhase.EndOfTurn,
-                    Predicates = [new() { Kind = ERulePredicateKind.TurnAtLeast, Turn = 2 }],
-                    Effects = [new() { Kind = ERuleEffectKind.EmitWarning, Message = "serialized" }]
-                }
-            ]
+            Leaks = [new() { Carrier = ECarrierType.Electricity, UndergroundPosition = new(6, 4), AccessPosition = new(6, 3) }]
         };
+        level = DoorLevel(level);
 
         var loaded = LevelSerializer.Deserialize(LevelSerializer.Serialize(level));
 
-        Assert.Single(loaded.Doors);
+        Assert.Equal(EPropType.Door, loaded.GetProp(new(3, 2)).Type);
         Assert.Single(loaded.Leaks);
-        Assert.Single(loaded.RuleEvents);
         Assert.Equal(new(6, 3), loaded.Leaks[0].AccessPosition);
-        Assert.Equal("authored", loaded.RuleEvents[0].Id);
     }
 
     [Fact]
@@ -380,43 +263,45 @@ public sealed class SimulationEngineTests
     {
         var json = """
                    {
-                     "Version": 1,
+                     "Version": 2,
                      "Level": {}
                    }
                    """;
 
         var exception = Assert.Throws<InvalidOperationException>(() => LevelSerializer.Deserialize(json));
 
-        Assert.Contains("Unsupported level file version 1", exception.Message);
+        Assert.Contains("Unsupported level file version 2", exception.Message);
     }
 
     private static LevelState BuildReadyLevel()
     {
         var level = LevelState.Create("Ready", 8, 7);
-        level = AddLine(level, ECarrierType.Fuel, new(2, 2), new(3, 2));
+        level = AddLine(level, ECarrierType.Fuel, new(2, 3), new(3, 3));
         level = AddLine(level, ECarrierType.Coolant, new(2, 3), new(3, 3));
-        level = AddLine(level, ECarrierType.Electricity, new(2, 4), new(3, 4));
-        level = level.SetProp(new(2, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
-        level = level.SetProp(new(2, 3), new() { Type = EPropType.Flow, Carrier = ECarrierType.Coolant });
+        level = AddLine(level, ECarrierType.Electricity, new(2, 3), new(3, 3));
+        level = level.SetProp(new(2, 3), new() { Type = EPropType.Flow, Carrier = ECarrierType.Fuel });
+        level = level.SetProp(new(2, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Coolant });
+        level = level.SetUnderground(new(2, 2), ECarrierType.Coolant, new() { State = EUndergroundState.Intact });
+        level = level.SetUnderground(new(2, 3), ECarrierType.Coolant, new() { State = EUndergroundState.Intact });
         level = level.SetProp(new(2, 4), new() { Type = EPropType.Flow, Carrier = ECarrierType.Electricity });
-        level = level.SetProp(new(3, 2), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Fuel });
-        level = level.SetProp(new(3, 3), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Coolant });
-        level = level.SetProp(new(3, 4), new() { Type = EPropType.Consumer, Carrier = ECarrierType.Electricity });
+        level = level.SetUnderground(new(2, 4), ECarrierType.Electricity, new() { State = EUndergroundState.Intact });
+        level = level.SetUnderground(new(2, 3), ECarrierType.Electricity, new() { State = EUndergroundState.Intact });
+        level = level.SetProp(new(3, 3), new() { Type = EPropType.Consumer });
         level = level.SetProp(new(5, 3), new() { Type = EPropType.ReactorControl, ReactorId = 1 });
         return level with {
             Robot = new() { Position = new(5, 3) },
-            Reactors = [
-                new() {
-                    ReactorId = 1,
-                    ControlPosition = new(5, 3),
-                    FuelConsumerPosition = new(3, 2),
-                    CoolantConsumerPosition = new(3, 3),
-                    ElectricityConsumerPosition = new(3, 4)
-                }
-            ]
+            Reactors = [new() { ReactorId = 1, ControlPosition = new(5, 3) }]
         };
     }
 
+    private static LevelState DoorLevel(LevelState? seed = null)
+    {
+        var level = seed ?? LevelState.Create("Door", 6, 6);
+        level = level.SetTerrain(new(3, 1), ECellTerrain.Wall);
+        level = level.SetTerrain(new(3, 3), ECellTerrain.Wall);
+        return level.SetProp(new(3, 2), new() { Type = EPropType.Door, DoorState = EDoorState.Closed });
+    }
+
     private static LevelState AddLine(LevelState level, ECarrierType carrier, GridPosition a, GridPosition b)
     {
         level = level.SetUnderground(a, carrier, new() { State = EUndergroundState.Intact });
@@ -435,13 +320,5 @@ public sealed class SimulationEngineTests
         return level.SetProp(new(2, 3), new() { Type = EPropType.Junction, Carrier = ECarrierType.Fuel, JunctionMode = mode });
     }
 
-    private static LevelState AddHorizontalUnderground(LevelState level, ECarrierType carrier, int startX, int endX, int y)
-    {
-        for (var x = startX; x <= endX; x++)
-            level = level.SetUnderground(new(x, y), carrier, new() { State = EUndergroundState.Intact });
-
-        return level;
-    }
-
     private readonly SimulationEngine m_Engine = new();
 }