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

Last Nuclear Darkness

Patch notes: V 1.2.19.155

The following improvements and fixes were implemented:


  • Fixed bug in the lighting of some meters.
  • Fixed bug in transformer operation visual effect cycle.
  • Fixed bug that prevented an upgrade of all electric turbines.
  • Fixed bug in the automatic opening controls of the control room, which are not maintained when loading a saved progress.
  • Fixed bug in the position of the button on the upper door of the turbine room.
  • Fixed bug of AO getting stuck while hanging around the floor.
  • Fixed bug in the position of the condenser inlet tubes.
  • Fixed bug of the destroyed steam turbine appearing visually integral when loading a saved progress.
  • Fixed bug of position of the freight pumps, which in some cases appeared with the connections out of place.
  • Fixed bug in the Condenser drain valve, which did not allow the release of steam.


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

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

Patch notes: V 1.2.19.154

The following improvements and fixes were implemented:


    - Fixed the bug of the meters with the dark display.
    - Fixed the bug of missing textures in the transformer.
    - Fixed the bug in thermal efficiency meter.
    - Fixed the bug in the location of the turbine room surveillance camera.


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

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

New Steam Turbine

Improvements and fixes:


  • Added a new steam turbine model. More info at https://nuclearesgame.blogspot.com/2024/06/changes-in-turbine-building.html

  • Added new electric turbines (one for each loop).
  • Added a selector to the synchroscope to select the turbine to be synchronized.
  • Added meters for the new turbines in the power generation control station.
  • Added a level to the turbine building to accommodate the new steam turbines.
  • Added a new floor to the main building to connect the main corridor with the new level of the turbine building.
  • Added a new floor to the elevator.
  • Adjusted the generation and demand hertz from 51 to 50.
  • Adjusted the turbine compensator to work within a wider variation range.
  • Adjusted Apprentice mode so that resistance banks are not damaged during guided instruction.
  • Separated the steam turbines (one for each loop).

  • Fixed the bug with trophies for successful audits when there is no space in the display cases to store them.
  • Fixed the bug in label "Speed limited by wear or damage".
  • Fixed the bug of the M03 valve that could not be activated without climbing into the container.
  • Fixed the bug in the dosing pump, which did not continue dosing boron when loading a saved progress.
  • Fixed the bug in Apprentice mode, where the synchroscope did not detect that it was synchronized and did not allow that step to be advanced.


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

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

Patch notes: V 1.2.19.152

The following improvements and fixes were implemented:


    - New Steam achievements: Professional Analyzer, Maintenance Expert, Reactor Destroyer, Reversed Meltdown, Train Escape, Energy Master, Critical Mass.
    - Added pump speed indicator light "Limited by damage or wear".
    - Added ability to avoid confirmation when purchasing an upgrade by holding down the Shift key.
    - Added pump and reservoir indicators to the loading system valve panel.
    - Added alarm to warn that the energy delivered to the city dangerously exceeds demand.
    - Added volume meter to the main coolant panel for the reservoir that supplies the external vessel (pool) of the core.
    - Added third valve to the main coolant charging circuit to simplify the selection of which reserve tank to fill.
    - Added Steam icon to the main menu to warn if the player is logged in to the Steam service or not.
    - Modified current speed indicator of the primary coolant circuit to exclude pumps that are turned off.
    - Unified names of the pumps and tanks of the coolant control panel and the loading system valve panel.
    - Improved connection message with Steam to warn when there is no communication and the player is per player in the scenarios mode.
    - Disabled dynamic lights temporarily due to performance impact (can be activated manually from the config).
    - Replaced manual adjustment of internal times from the game settings menu with a new automated system.

    - Fixed bug of "Speed" label in the core status panel.
    - Fixed bug in the AO battery box tooltip.
    - Fixed bug in the translation of the dosing pump upgrade information.
    - Fixed bug in the color of the chemical circulation pump icon in the tablet commerce app.
    - Fixed bug in the red band of the chemical waste tank history meter.
    - Fixed bug in the core wear calculation with the active chemical module.
    - Fixed bug in help tooltips for the "Chemical Extraction Pump" and "Extraction Pump Connection Switch" switches.
    - Fixed bug in electrical transformers where their wear was not restored correctly when loading a savegame.
    - Fixed bug that allowed you to see through the wall behind the security suit containers.


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

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

Patch notes: V 1.2.19.151

The following improvements and fixes were implemented:


    - Fixed bug when loading a savegame with a Class D generator set (new DLC)


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

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

DLC enabled

Improvements and fixes:


  • Activating the ability to load a DLC.
  • Improvements were made to the model and textures of the circulation pumps.
  • Improvements were made so that removing the AO battery does not affect performance.
  • Added Project Booster section in the game credits.
  • Added the Nuclear sponsors billboard in the entrance of the plant (near the core door).
  • Added a new difficulty level: Apprentice
  • Added step-by-step tutorial for guided startup at Apprentice level.
  • Removed the ability to change the difficulty level during gameplay.

  • Fixed bug in resistance bank wear calculation.
  • Fixed bug that prevented collecting the geiger counter from the floor inside the elevator.
  • Fixed bug of the inlet and outlet valves of the ion column, which did not initially show their correct opening value.
  • Fixed bug that allowed water pump to be changed in the tablet's market app when the location selection form was open.
  • Fixed bug in the tooltip of the "Power capacity" meter of the electric generating turbine.
  • Fixed bug of the sound of the internal doors of the control room, which did not respect the volume set by the player.
  • Fixed bug of the turbine valve bypass regulator when the link was active, which modified the valves of the turbines not installed.


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

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

Patch notes: V 0.2.19.148

The following improvements and fixes were implemented:


  • Fixed bug of blur on the video surveillance screen.
  • Fixed bug in the boron dosing pump, which did not allow it to be stopped when entering 0 (zero) as the quantity.
  • Fixed bug in the boron dosing pump, where it did not reach the required speed in some values.


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

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

Patch notes: V 0.2.19.147

The following improvements and fixes were implemented:


  • Added a fill level meter to all containers inside the plant.
  • Modified the scale of the THERMAL POWER vs ELECTRIC POWER graph to make it easier to understand.
  • Modified the scale of the historical turbine power graph so that the operating power does not fit into the red zone.
  • Improvements were made to the textures of the generating turbines.

  • Fixed bug when loading a saved game with the boron dosing pump active.
  • Fixed bug with the position of the evaporators in the core section of the market app.
  • Fixed bug that prevented the truck charging pump from being turned off, if it was disconnected from the truck while it was running.
  • Fixed bug of the truck that never managed to leave the plant.
  • Fixed bug of video surveillance monitor, which did not correctly recover its status when loading a savegame.
  • Fixed bug with water ripples on grass.
  • Fixed bug on turbine torque meter label and tooltip.


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

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

Patch notes: V 0.2.18.146

The following improvements and fixes were implemented:


  • Added a THERMAL POWER meter with historical values on the reactor fuel control panel.
  • Added a THERMAL EFFICIENCY graph on the reactor fuel control panel.
  • Added the "Operating range" to the tooltip of some meters.

  • Fixed bug in the bypass valves of the generating turbines, which did not allow a consistent bypass throughout their opening range.
  • Fixed bug that did not show the chemical circuit pumps in the report and in the maintenance tasks.
  • Fixed bug that did not show some container tanks in the report and in the maintenance tasks.
  • Fixed bug that caused a softlock when using the iodine injector or the valves manually with the invisible avatar option activated.
  • Fixed bug inside the supply room where rain was leaking through the ceiling.
  • Fixed bug of the safety valves of the ion column circuit, which did not recover their state when loading a savegame [2].
  • Fixed bug when loading a previous save game, which caused the Pressurizer heaters to break.
  • Fixed bug where, when starting or loading some games, AO would appear wet and drying in the charger.
  • Fixed bug where it was possible to start a scenario with the options to continue (save slots) on the screen.


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

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

Patch notes: V 0.2.18.145

The following improvements and fixes were implemented:


  • Reduced by 25% the absorption capacity of iodine-135.
  • Increased by 25% the absorption capacity of xenon-135.
  • Increased by 30% the xenon generation rate due to iodine degradation.
  • Reduced by 15% the incidence of temperature in the degradation of iodine.
  • Reduced by 15% the incidence of the presence of boron in the degradation of iodine.

  • Moved the "Chemical Module enable" option from the game settings to the level selection windows when starting a new game.
  • Modified alarm label from TURBINE OVERLOAD-REVVING to TURBINE OVERLOAD.
  • Modified the numeric keypads so that they queue keystrokes and thus make it easier to enter a value.
  • Increased the time AO waits to repeat a recommendation (from 5 to 15 minutes).
  • Replicated the core reactivity meter in the chemical treatments panel.

  • Fixed bug when loading a savegame, where the pressurizer heaters did not recover their state correctly.
  • Fixed bug in the generator turbine / breaker / synchroscope so that the RPM is always maintained when the breaker is closed.
  • Fixed bug that prevented some buttons from being pressed when the player was wearing the hazmat suit.
  • Fixed bug of AO reporting that turbines required maintenance when they did not.
  • Fixed bug of the safety valves of the ion column circuit, which did not recover their state when loading a savegame.


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

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