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

Last Nuclear Darkness

Patch notes: V 0.2.15.130

The following improvements and fixes were implemented:


  • Connected the plant to an external electricity supplier (with cost per consumption).

  • Corrected and reduced internal consumption values.

  • Modified the power of the generator sets and batteries to adjust them to the new values.

  • Modified the indicator lights on the lever-type valves to avoid confusion with their opening status.

  • Emergency batteries can no longer be used to supply power to the pumps or Pressurizer heaters.

  • Fixed bug of invalid tank truck service when loading saved progress.

  • Fixed bug in the valves in the chemical treatments building, which did not save their opening status.

  • Fixed bug in the emergency battery rack, where they continued to consume energy despite selecting the charging mode.


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 0.2.14.129

The following improvements and fixes were implemented:


  • Improved the invalid class warning when trying to install a freigth pump in the wrong position.

  • Added the possibility of canceling a requested tanker truck service (logistics app on the tablet).

  • Added the possibility to activate zoom mode with the mouse wheel.

  • Fixed bug in the hand animations when pressing the access barrier buttons.

  • Fixed bug in help tooltips for the coolant reservoir fill level gauges.

  • Fixed bug when selling or discarding a freight pump from the external or chemical circuit.


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 0.2.14.127

The following improvements and fixes were implemented:


  • Added to the options menu the possibility of adjusting the internal times of the simulator engine.
    More info at https://nuclearesgame.blogspot.com/2024/02/configurable-internal-simulator-engine.html

  • Added the internal reservoir purge valve to the main valve panel.

  • Added missing colliders.

  • Made visual corrections and improved the exterior area where the pumps and the main reservoir are located.

  • Fixed bug in the Steam Admission valve that did not maintain the open state when saving progress.

  • Fixed bug in the Pressurizer thermostat, which did not reactivate the heaters.

  • Fixed bug in door status manual mode when loading saved progress.

    Chemical treatments module (experimental):

  • Added the procedure for requesting and loading the Boron and NaOH reserve tanks.

  • Added a new bridge and tank truck.

  • Added a loading area and connection to the chemical treatments building.

  • Added two new surveillance cameras: Loading zone entrance and Loading zone.


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 0.2.14.126

The following improvements and fixes were implemented:


  • Fixed bug of the primary circuit and condenser freight pumps.

  • Fixed translation of CHEMICAL WASTE.

  • Fixed CHEMICAL WASTE job time and cost.


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 0.2.14.125

The following improvements and fixes were implemented:


  • Added a reservoir to accumulate water outside the plant.

  • Added a freight pump to the external reservoir.

  • Added a freight pump to the internal reservoir inside the containment building.

  • Added new pump controls to the coolant console in the control room.

  • Added an option to activate or deactivate the generator turbine compensator.

  • Optimized the latency of the needle meters so that they update faster.

  • Fixed bug in internal energy consumption when the Pressurizer thermostat is activated.

  • Fixed bug in the compensator of the generating turbines.


    Game manual

  • Added an entry for the Pressurizer heaters thermostat.

  • Added an entry for the compensator of the generating turbines.

  • Added an entry for the controls of the pumps that supply the primary circuit.


    Chemical treatments module (experimental)

  • Added the maintenance task: treatment and disposal of chemical waste.

  • Fixed bug in the circulation of the ion absorption column cleaning pump.



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 0.2.13.124

The following improvements and fixes were implemented:


  • Fixed bug in the circulation of the primary circuit when the pumps are at 100% speed.

  • Fixed bug in the thermostat of the Pressurizer heaters. The heaters stopped heating when you turned thermostar off.

  • Fixed bug in the absorption column, where it continued to emit an operating sound even though there was no coolant circulation.

  • Fixed bug in the circulation pump oil meter.


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 0.2.13.123

The following improvements and fixes were implemented:


  • Fixed bug when adjusting bypass valves when the game is running at accelerated speed.

  • Fixed the inconsistency of colors in the outlet tubes outside the Condenser.

  • Added a compensator to the generating turbine to avoid power fluctuations and achieve faster stabilization.

  • Added missing colliders, especially in the chemical treatment room.

  • Added a thermostat on the Pressurizer heaters.

  • Reduced the volume of sound effect of the internal doors of the control room.


Chemical treatments module (experimental):

More info at https://nuclearesgame.blogspot.com/2024/01/chemical-treatments-module-experimental.html


  • Fixed bug in the absorption column, where it continued to emit an operating sound even though there was no coolant circulation.

  • Fixed the absorption level meter to include the action of boron within the Core.

  • Fixed bug of the lights always being off in the chemical treatments building (Dynamic lights).

  • Fixed bug in the speed regulators of the chemical circulation pumps.

  • Fixed bug of incorrect type circulation pump when loading a saved progress.

  • Fixed Xenon poisoning meter.

  • Fixed Xenon generation and degradation calculation.

  • Reduced the volume of sound effect of the dosing pump.


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!

Chemical treatment module

New Internal Synchronization System.

A new synchronization system has been implemented to enhance game performance. This system
adapts to the computer's processing power, allowing the game to run smoothly in various situations.

More info at https://nuclearesgame.blogspot.com/2024/01/internal-synchronization-system.html


Cooperative Mode Disabled

The cooperative mode has been deactivated due to the rapid and significant changes the game has
undergone recently. Adapting the cooperative mode to these changes requires substantial work, and
as a result, bugs have accumulated over time. The introduction of the new synchronization system
and the experimental chemical treatment module has further exacerbated existing issues.

More info at https://nuclearesgame.blogspot.com/2024/01/cooperative-mode-disabled.html


Improvements and fixes:

- Improved the Pressurizer overpressure calculation.
- Improved Pressurizer damage calculation due to uncontrolled overpressure (normal level only).
- Improved fluid circulation calculation.
- Improved the internal synchronization process to avoid inconsistencies when changing the game speed.
- Repair tasks with the core offline now always last one hour.


Chemical treatments module (experimental):

Within the core of a nuclear reactor, xenon is produced as a byproduct of nuclear fission. When uranium or plutonium atoms undergo fission during the nuclear reaction, various fission products, including xenon, are released. This inert gas has the ability to absorb neutrons, which can adversely affect the efficiency and stability of the reactor.

More info at https://nuclearesgame.blogspot.com/2024/01/chemical-treatments-module-experimental.html


- Added the chemical treatments building attached to the Core containment building.
- Added chemical treatment control station in the control room.
- Added an ionic column to filter boron.
- Added two circulation pumps in the chemical treatments building.
- Added a boron dosing pump to the chemical treatment building.
- Added the possibility of circulating a Boron solution through pipes and containers.
- Added the possibility of circulating a NaOH solution through the pipes and containers.
- Added the possibility of circulating Xenon gas through pipes and containers.
- Added calculations to generate Xenon within the Core.
- Added calculations for corrosion and rust generation in pipes.
- Added calculations for damage to circulation pumps with rust accumulation.
- Added calculations to determine the pH of the coolant.
- Added calculations that affect Boron absorption depending on pH.
- Added calculations for damage to pipes due to circulation of corrosive fluid.
- Added boron interaction calculations with the Core, Xenon gas, NaOH solution and cooling water.

Note that some features, such as refilling boric acid, NaOH, and water tanks for cleaning, are not yet implemented. Special circulation and dosing pumps cannot be purchased or repaired. AO is not aware of experimental changes and cannot provide assistance. Older savegames may become incompatible with future releases, and savegames from the previous version are not compatible with the chemical module.

Patch notes: V 0.2.13.121

The following bugs were fixed:


  • Fixed bug of missing fuse box for secondary drain valve panel.

  • Fixed bug of the manually analyze button that had been hidden in the tablet maintenance app.

  • Fixed bug in the valve operation selectors, which continued to work without a fuse or with the switch off.

  • Fixed bug in Amperes display (one more digit was added).

  • Fixed bug in the numeric keyboard that did not respond to the numeric keys on the physical keyboard.

  • Fixed bug of the position of the fuse in the player's hands.

  • Fixed bug that prevented destroying the fuses when throwing them in the trash can.

  • Fixed bug of the fuse passing through the bottom of the trash can.

  • Fixed bug of visuals glitch in the transformation room.

  • Fixed bug of operating crane fuel gauge.

  • Fixed bug of Stable RPM light help tooltip.

  • Fixed bug of remnants of the original name of the resistance banks (Accumulators).

  • Fixed bug that allowed more than one turbine to be purchased per order (it is not a retroactive fix).

  • Fixed bug of running/walking animation during interaction with Synchroscope or keypads.


- Added the chemical treatment room (not yet enabled).

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 0.2.13.120

The following improvements have been made:


  • Added fuses and switch boxes to the rear of the control room control panels.

  • Added camera rotation allowance when using synchroscope (for resolutions that cannot see all buttons).

  • Added Condenser filter to the tablet's alarm configuration app.

  • Added the ability to press the ALT key when using the regulator to increase the step.

  • Added the ability to place the Geiger counter in its original location.


The following bugs were fixed:


  • Fixed bug in the transformer voltage indicator when one is turned off.

  • Fixed visual bugs due to the control room resizing.

  • Fixed visual bug on screen when holding down any synchroscope button (now it is +1 or -1 as appropriate).

  • Fixed bug of bar graph scales.

  • Fixed bug on alarm for high temperature in the Condenser.

  • Fixed bug with doors always having power when in manual mode.


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!