Last Nuclear Darkness cover
Last Nuclear Darkness screenshot
Genre: Simulator, Adventure, Indie

Last Nuclear Darkness

Patch notes: V 0.2.18.144

The following improvements and fixes were implemented:


  • Improvements and dynamic load control were made to accelerate fast time as much as possible.

  • Added an option in AO settings to enable it to roam and analyze the plant freely when it is not busy with other tasks.
  • Added an additional progress bar to the AO app to differentiate total progress from current task progress.

  • Reduced the brightness of the fog visual effect during rain.
  • Reduced Iodine generation in relation to power by 25% (and 50% at easy level).

  • Fixed bug that prevents the ion absorption column from being repaired.
  • Fixed bug in AO charger, which would stay on even if AO was not in it.
  • Fixed bug in AO App, where they showed 100% repair progress when starting tasks.
  • Fixed bug of "working" face icon not displaying correctly when AO was performing a repair task.
  • Fixed bug in the status lights of resistance blocks in the resistance banks when loading a saved game.
  • Fixed bug with the treatment room door switches when loading a savegame.
  • Fixed bug in the meters of the internal and external tanks of the chemical treatment room, where both measured the internal tank.
  • Fixed bug in the scales of the meters with historical graph of the chemical treatment room.
  • Fixed bug with turbine sounding even when stopped and under repair.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The chemistry module is not compatible with previous saved progress.


We are waiting for you in the game's Discord!

Patch notes: V 0.2.18.143

The following improvements and fixes were implemented:


  • Fixed bug with corrupted control rod controller when loading a savegame.

  • Fixed bug in labels of the manual inlet and outlet valves of the ion column.

  • Fixed bug in AO message where it indicated Low battery, when in reality it did not turn on because it is wet.

  • Fixed bug that prevents starting the scenarios.

  • Fixed bug in the valve indicator on the coolant loading control panel.

  • Fixed bug in some manual valves, which did not correctly recover their state when loading a savegame.

  • Fixed bug in some translations (English language).


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The chemistry module is not compatible with previous saved progress.


We are waiting for you in the game's Discord!

Patch notes: V 0.2.18.142

The following improvements and fixes were implemented:


  • Fixed bug that prevented the loading of some savegames from the previous version.
  • Fixed bug in some translations (reactivity panel labels).
  • Fixed bug of activity monitor danger sign overlap.
  • Fixed bug on bombs B1 and C1 icons on the tablet location graph.
  • Fixed bug that prevented you from seeing the blue glow and bubbles of the reactor underwater.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Chemical treatment module

Improvements and fixes:


  • Enabled the possibility of activating or deactivating the chemical module. More info at https://nuclearesgame.blogspot.com/2024/04/chemistry-module.html

  • Added Iodine to the simulation.
  • Added Iodine activity and concentration monitoring meters to the core console in the control room.
  • Added the purchase management of the pumps associated with the chemical module to the tablet's commerce app.
  • Added the management of the pumps associated with the chemical module in the tablet machines app.
  • Added an engine power control that positions the control rods.
  • Added a button to the Bank app on the tablet to pay full loans.
  • Added the possibility of cleaning residual Xenon and Iodine to the Core maintenance tasks, to avoid the waiting time required for its natural degradation.

  • Improved the location map when purchasing components for the plant.
  • Unified the names of the tanks within the reactor containment building.
  • Changes were made and better detail of the operation of the levers inside the transformer room was added.

  • Fixed bug in valve names on the valve panel of the chemical treatment monitoring console.
  • Fixed bug in the fuel loading animation of the generating set.
  • Fixed bug of AO battery, where AO worked without a battery or did not allow it to be turned on even if it had charge.
  • Fixed bug when using the keypads to move the fuel blocks, where the value 9 appeared.
  • Fixed bug in the transformers, where the operating visual effect was still active even if they had been disconnected.
  • Fixed bug of dark video on the video surveillance monitor.
  • Fixed bug when activating zoom with an object in hand.
  • Fixed bug with incorrect lighting when holding certain objects in your hands.
  • Fixed bug that allowed you to see inside the resistance bench (clipping).
  • Fixed bug of the meters with history, where the graph was not correctly recovered when loading a saved game.
  • Ficed bug of memory consumption of meters with history graph.
  • Fixed bug of negative value in Prestige Points.
  • Fixed bug in some translations (German language).


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.17.140

The following improvements and fixes were implemented:


  • Fixed bug with the indicator lights missing from the fuel block containers in the control room.
  • Fixed bug with inverted labels on the external reactor vessel load pump actuator.
  • Fixed bug with glare in the control room when activating dynamic lights.
  • Fixed bugs when interacting with the train buttons: door opening, trip start, trip selector.
  • Fixed bug in the position of the AO battery in the player's hands, which prevented it from being placed back in the robot.
  • Fixed bug in the energy absorbed indicator of resistance banks, when activating a bank without resistance blocks.
  • Fixed bug with the core's radioactivity visual effect on water.
  • Fixed bug in the radioactivity sensors, which were not deactivated even if the area had been decontaminated.

  • Added the description of the area that requires decontamination to the pending maintenance tasks report.
  • Improved tube textures so that they look correct even in low quality.
  • Improved the interaction of the advanced core vessel water simulation with the control rods.
  • Improved the animation of the advanced water simulation so that there are no jumps when lowering the level inside the external vessel.
  • Increased the sound emitted by the generating turbine so that it can be heard again from the control room.
  • Modified the fast-time time format from hh:mm to hh H : mm M : ss S to unify the indicators and avoid confusion.
  • Blocked the ability to modify dynamic lights, as well as changing the quality profile during the game, to prevent graphical glitches.
  • Enlarged the window between the control room and the reactor core.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.17.139

The following improvements and fixes were implemented:



  • Fixed bug in the labels on the freight circuit panel.
  • Fixed bug in the position of the tablet when holding it in your hand.
  • Fixed bug in the synchronization of the interaction animation when the game runs at low fps (hand pressing away from the control).
  • Fixed bug in the A6 valve actuator.
  • Fixed bug of the sound of turbine starts when pressing pause.
  • Fixed bug in the valve panel where manual lever valves did not update their status.
  • Fixed bug in the animations of doors with handles, which opened and closed inconsistently.
  • Fixed some translations (English language).

  • Modified the fast-time time format from hh mm ss to hh mm.
  • Modified keyboard behavior to return it to its original behavior.
  • Improvements were made to hand movement synchronization.
  • Improvements were made to the fluidity of animations when interacting with controls.
  • Improvements were made to some graphical in the control room.

    Chemical treatments module:

  • Added the analysis of rust present in pipes, valves and pumps, and the warning in the maintenance report.
  • Rust accumulated in hydraulic valves reduces their opening and closing speed, and increases the chances of failure and jamming.
  • Fixed bug in the supply room that allowed you to see through a wall.
  • Fixed bug in the switches on the control panel in the chemical treatment room.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.17.138

The following improvements and fixes were implemented:


  • Added the ability to activate cursor mode at any time to interact with any switch.
  • Added the valve panel of coolant loading circuits.

  • Improvements were made to the player's avatar animations when interacting with switches: hand position, rotatiom, movement synchronization, etc.
  • Improvements were made to the proportion of the player's avatar and the placement of some controls and switches.
  • Improvements were made so that the player can interact with the hand closest to the switch, making interactions more dynamic.
  • Improvements were made to player positioning routines on control consoles when interacting with switches.
  • Improved the control rod temperature dissipation calculation based on position.

  • Modified the Synchroscope so it can be manipulated without trapping the player's focus.
  • Modified the Synchroscope RPM display to show the current RPM instead of the Synchroscope offset.
  • Modified the behavior of the Synchronizer buttons, so that for safety reasons they do not respond if the breaker is closed.
  • Modified the notice "The reactor core must be offline" in the tablet's tasks app. Now only appears if the core is in a reactive state.
  • Modified the virtual keyboards exit key from ESC to SPACE BAR to avoid conflicts with some settings.
  • Modified the way the player interact with virtual keyboards to make it faster.
  • Modified the density of trees outside to improve game performance.

  • Fixed bug that prevented advanced reflections from being disabled.
  • Fixed bug of critical mass animations when changing reactor operating mode.
  • Fixed bug of repeated events in the maintenance report.
  • Fixed bug that sometimes occurred where the avatar's hand or arm would be stuck in the air without any object in it.
  • Fixed bug in the operating crane camera, which did not allow you to see correctly underwater or when there was radioactivity.
  • Fixed bug in the valve opening indicators, which did not update quickly enough while turning the handle manually.
  • Fixed bug with valve panel not starting properly updated after loading a saved progress.
  • Fixed bug with resistances lost on repair clamps when loading saved progress.
  • Fixed bug when calculating wear based on use.
  • Fixed some translations (English language).

  • Made optimizations to improve game performance.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.16.137

The following improvements and fixes were implemented:


  • Added a detail to the plant situation report with the events that caused damage to the main components of the plant.

  • Added the concept of Safe Core, to make it clearer when maintenance or other actions can be carried out on the reactor.

  • Added the ability to press Shift + Right Click to access information mode, without activating zoom.

  • Recalculated the power generated by the electric turbine at low revolutions.

  • Fixed bug in the help tooltips on the turbine admin valve panel.

  • Fixed bug of steam generator disappearing when loading saved progress.

  • Fixed bug that did not allow the time to be accelerated, indicating that the core had to be in a non-reactive state.

  • Fixed bug that allowed the player to walk even with the zoom applied.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.15.135

The following improvements and fixes were implemented:


  • Fixed bug of invisible outside terrain.

  • Disabled AO help instructions from the tablet app.

  • AO capacity was reduced to basic maintenance and control tasks.


Chemical treatments module (experimental): TESTING ONLY / NOT PLAYABLE


  • Fixed bug in the scale of the historical graphs of Xenon measurements.

  • Adjusted Xenon generation or degradation peaks produced by changes in reactor power.


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!

Patch notes: V 0.2.15.134

The following improvements and fixes were implemented:


  • Added the "External Power Outage" event when catastrophe events are active.

  • Added a new event "Do not consume power from the external supply for n hours" to receive a prize in prestige points.

  • Added an option in advanced graphics settings to modify the quality level of outdoor vegetation. If the quality level is low, the animated wind effect is also disabled.

  • Added an action response screen to the fuel module control station.

  • Modified the concept of Non-Reactive Core: it will no longer be necessary to remove the fuel block.

  • Simplified the time adjustment slider in game settings and enabled its use during gameplay (no longer an experimental option).

  • Fixed bug that allowed the speed of time to be modified during the accelerated time animation.


Chemical treatments module (experimental): TESTING ONLY / NOT PLAYABLE


  • Added calculations and behaviors related to the generation and disintegration of Xenon due to increase or decrease in reactor power.

  • Added Xenon generation and core poisoning calculations during shutdown.

  • Added indirect interaction calculations of boric acid on the Xenon present in the core.

  • Added indicator lights to alert Xenon increases or degrades due to reactor power changes.

  • Modified the behavior of the fuel block: if it is removed from the core, it cannot be reused.

    More info at https://nuclearesgame.blogspot.com/2024/03/chemical-module-xenon-generation-and.html


This update is compatible with all previous savegames. If you're having trouble loading a saved progress, please let me know!

The experimental chemistry module is not compatible with previous saved progress.

We are waiting for you in the game's Discord!