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

Last Nuclear Darkness

Patch notes: V 2.2.25.194

[p]The following improvements and fixes were implemented: [/p][p][/p][p]- Fixed a bug that caused accelerated wear on the vacuum pump and ejector.[/p][p]- Fixed a bug with surveillance cameras and the rain effect.[/p][p]- Fixed a bug in the Machines and Upgrades app where the selection buttons would sometimes remain active.[/p][p]- Fixed the bug with pressurizer heater wear not showing up in maintenance report \[2].[/p][p]- Fixed the bug of the missing door opening control panel in the Turbine Room.[/p][p]- Fixed a bug where the trophy room doors would not open when loading a saved progress without energy.[/p][p]- Fixed bug in audits repeated on consecutive days.[/p][p]- Fixed bug in external power supply cutoff information.[/p][p]- Fixed an autosave issue when the option to always overwrite the same file was selected.[/p][p]- Added a message history to the tablet communications app.[/p][p]- Adjusted cable resistance to prevent frequent failures due to lack of maintenance.[/p][p][/p][p] We are waiting for you in the game's Discord![/p]

Patch notes: V 2.2.25.193

[p]The following improvements and fixes were implemented: [/p][p][/p][p]- Fixed the zero display of the resistance bank capacity after loading a saved progress.[/p][p]- Fixed the issue with massive short circuits when loading a saved progress.[/p][p]- Fixed the issue with the reactivity meter, which had become inaccurate.[/p][p]- Fixed the bug in the balance gauges where the needle would move off the scale.[/p][p][/p][p] We are waiting for you in the game's Discord![/p]

📢 Condenser Vacuum System Overhaul!

[p]🛠️ In previous versions of the game, the condenser was… well, a bit easier to manage. The vacuum pump worked like magic — no need for motive steam — and condensation happened instantly. Convenient? Sure. Realistic? Not really 😅[/p][p]With this update, things get a lot more interesting (and a bit more challenging!):[/p][p]🔄 New Vacuum System: Ejector + Vacuum Pump[/p][p]Vacuum is now generated more like in a real nuclear reactor:[/p]
  • [p]The Ejector requires motive steam to work. It can’t create vacuum on its own.[/p]
  • [p]The Vacuum Pump helps, but it depends on how the gases are flowing.[/p]
  • [p]Condensation is no longer instantaneous — it's calculated realistically (yes, actual physics involved! 💡).[/p]
[p]This means keeping the condenser in balance now takes some attention.
But don’t worry — to help you understand what’s going on, we’ve added two new indicators:[/p]

📊 How to Read the New Indicators

[p]Condensate Flow Rate[/p]

[p]Shows how much steam is being condensed into water each second.[/p]

  • [p]🔼 High values: Lots of steam is entering the condenser, and condensation is working well.[/p]
  • [p]🔽 Low values: Might mean there’s little steam left, or that condensation efficiency is dropping.[/p]
[p]This tells you if the system is actively turning steam into water — and how well it’s doing it.[/p]
[p]Extraction Flow[/p]

[p]Indicates how much condensed water (feedwater) is being pumped back to the steam generators.[/p]

  • [p]If this value is higher than the condensate flow, you're extracting more water than you're producing — the condenser will eventually run dry.[/p]
  • [p]If it's lower, water is building up — and the condenser could eventually overflow.[/p]

🎯 What’s the Goal?

[p]Balance!
You want the incoming steam, the condensed water, and the extraction rate to stay in harmony.[/p][p]But don’t worry — it’s not about keeping everything perfectly stable all the time.
When you're ramping up power, shutting down the reactor, or adjusting valves, temporary imbalance is expected.[/p][p][/p]
[p][/p][p] PATCH NOTES:
[/p][p]- Fixed the steam visual effect on the cooling towers even without water circulation.
- Fixed the bug causing high oil consumption when the circulation pumps were turned on.
- Fixed visual bug in the green light for accessing the core.
- Fixed the bug accessing the stairs in Loop 2 inside the containment building.
- Fixed the bug in the initial objective to find the generator set.
- Fixed bug in primary circuit speed indicator when pump speed is set to 0 (zero).
- Fixed bug with pressurizer heater wear not showing up in maintenance report.
- Fixed bug that prevented AO from properly accessing your charger.
- Fixed bug that allowed reactor hatches to be opened when thermal control was active.
- Fixed an issue where the water in the external vessel could be seen from the core's interior surveillance camera.
- Fixed color coding in the maintenance report (KerballOne).
- Fixed labels on alarm lights that sometimes appeared with the text cut off at the last letter.
- Fixed bug with erratic sun movement.
- Fixed flickering of some transparent elements and icons in the interface.
- Added condenser vacuum circuit in control room: diagram, valve panel and controls.
- Added 3D model of condenser vacuum pump.
- Added 3D model of air ejector.
- Added new gauges to monitor the liquid and vapor balance within the evaporators.
- Added new gauge to monitor the liquid and vapor balance within the condenser.
- Added a control in game settings for the maximum number of days of stats to save.
- Added an option in the game settings to adjust the zoom smoothing level.
- Added an option in the game settings to adjust the level of player movement smoothing.
- Adjusted evaporation and condensation calculations within the condenser \[2]. [/p][p]More info at https://nuclearesgame.blogspot.com/2025/05/condenser.html [/p][p]- Modified autosave to always overwrite the same file (optional in game settings). - Improved zoom system to make it smoother and ensure proper functionality on setups with high resolutions and refresh rates. - Improved player control to make movements and camera rotation smoother. - Improved avatar hand movement and positioning on objects to make it smoother. - Improved Service Compliance Demand chart vertical scale on first hour of the day (KerballOne). - Improved the refresh rate of the number panels. - Redesigned the evaporator control panel. - Removed the Stats in Memory option from the game settings, as disabling it to save memory renders the game unplayable on almost any setup. - Removed the limit on the number of products per order. - Made several refactorings to the game core to improve performance and memory usage. WBSERVER - Fix autostart of webserver (KerballOne). - Fix STEAM_GEN variables for not-installed steam generators (GHXX). - Add STEAM_GEN_X_RETURN_FLOW_PLUS_CONDENSED variable (GHXX). - Add WEBSERVER_BATCH_GET for getting multiple variables at once (GHXX). - Webserver fixed error handling in some Set endpoints - Webserver renamed switch Variables to indicate if they are from a switch - Webserver added pipe volume/capacity and pump state data to VALVE_PANEL_JSON The key is:
You now have real tools to understand what’s going on inside the condenser — and to manage it like a true reactor operator.[/p][p][/p][p]Welcome to the new era of the condenser in Nucleares![/p]

Patch notes: V 2.2.23.190

The following improvements and fixes were implemented:


    - Fixed the bug when discarding a fuel block, which appeared in maintenance tasks as incorrectly located.
    - Fixed AO map to prevent it from clipping through supply room shelves.
    - Fixed bug in boron filtration column that visually appeared to be working even though it was not [2].
    - Fixed bug in MSCV display selector when turbine control panel was off.
    - Fixed the NO POWER IN COOLING TURBINE alarm error that was triggered in some situations without reason.
    - Fixed a bug with genset room lights where the lamps would continue to glow even when turned off.
    - Fixed bug with external power available indicator light where it was green instead of red.
    - Fixed AO pathfinding bug that prevented it from reaching the Pressurizer.
    - Fixed the bug of premature wear of the generator sets during start-up.
    - Fixed low oil consumption during circulation pump warm-up.
    - Adjusted the cost of transformers and resistance banks, and the costs of associated upgrades, to balance them across classes.
    - Adjusted evaporation and condensation calculations within the condenser.
    - Adjusted the ranges of the alarm speakers.
    - Added an external evacuation siren.
    - Added new trophies for successful audits.
    - Smoothed out sun rotation if game performance allows.
    - Modified the outage notice on the consumption monitor to include the days.
    - Modified the deterioration calculation for pressurizer heaters so that they require less frequent maintenance.
    - Modified the game update process so that it never overwrites the player's configuration file.
    - Improved the external water shader to react correctly to daylight.
    - Improved the unsimulated water shader for the external reactor vessel so it doesn't appear static.
    - Improved player positioning and animation when manually opening doors during a blackout.
    - Improved the 3D model of the rotating emergency lights.
    - Improved the 3D model of the regulator knobs.
    - Improved the 3D model of the selectors.
    - Improved the damage effect during the reactor explosion.

    WEBSERVER

    - Color Coded Maintenance Report and Tasks
    - Webserver updated FUN_DECREASE_INTEGRITY to include Generators and Turbines.
    - Webserver new FUN_FIRE_DRILL to set off a random alarm for X minutes.
    - Added CORE_EMERGENCY_STOP, CORE_END_EMERGENCY_STOP, STEAM_TURBINE_TRIP, and RESET_AO to webserver
    - Webserver GET variable for active alarms
    - New webserver features to allow users to set a custom port, listening interface (localhost or all), and to auto-start on game load.
    - Fixed webserver ability to properly restart after loading a saved game.
    - Tablet Service Compliance demand graph improved dynamic vertical scale to improve readability.
    - Added COOLANT_CORE_FLOW_IN and COOLANT_CORE_FLOW_OUT (Ker Ball One).
    - Added the webserver GET variables COOLANT_CORE_CIRCULATION_PUMP_X_CAPACITY and COOLANT_SEC_CIRCULATION_PUMP_X_CAPACITY for reading the maximum amount of fluid the respective pumps (X ranging from 0 to 2, inclusive) can move, in L/min (Ker Ball One).
    - Added WEBSERVER_VIEW_VARIABLES (Ker Ball One), which is the human-readable equivalent to WEBSERVER_LIST_VARIABLES. If you are reading the webserver variables using automation, always use LIST instead of VIEW, as we may be changing the VIEW formatting over time.
    - Added the following webserver GET variables (Ker Ball One): TIME_DAY (to easily get the current day number), CHEM_BORON_DOSAGE_ORDERED, CHEM_BORON_DOSAGE_ACTUAL, CHEM_BORON_FILTER_ORDERED, CHEM_BORON_FILTER_ACTUAL, CHEM_BORON_DOSAGE_ORDERED_RATE, CHEM_BORON_FILTER_ORDERED_SPEED, POWER_MAX_THEORETICAL_FINAL_PLANT_OUTPUT_MW, CHEM_BORON_PPM
    - Added the webserver GET variable CORE_FACTOR_CHANGE, representing by how much the thermal output has changed since the previous simulation cycle (This is similar to the reactivity gauge of the single fuel rod reactor).
    - Added webserver variable for triggering a SCRAM button press. (Ker Ball One)
    - Added the webserver variables CORE_POOL_COOLANT_TANK_VOLUME, CORE_PRIMARY_CIRCUIT_COOLING_TANK_VOLUME and CORE_EXTERNAL_COOLANT_RESERVOIR_VOLUME.


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

Patch notes: V 2.2.23.189

The following improvements and fixes were implemented:


    - Fixed incorrectly positioned help indicators in the supply room.
    - Fixed an issue where purchasing fuel blocks or control rods was not possible even if there was storage space.
    - Fixed an bug in the Machines app where an incorrect value was displayed in the Water Pump Flow Capacity field.
    - Fixed an bug in the allocation of audit awards in the new showcases.
    - Fixed bug in boron filtration column that visually appeared to be working even though it was not.
    - Fixed a bug that allowed the water pump class to be changed just before confirming the purchase.
    - Fixed a bug when canceling a purchase, where the wrong bonus was applied to the refund.
    - Fixed bug in the control room door automation control switch.
    - Fixed an issue in the Machines and Upgrades app where the water pump preview wasn't displaying correctly.
    - Fixed an internal bug when displaying some items in the maintenance report.
    - Fixed an internal bug in the operation of the AO extender arm.
    - Fixed an internal bug when trying to verify if fission was reversed.
    - Modified the low volume alarm on the condenser so that it will not activate if the reactor is in shutdown mode.
    - Modified the water pump limit for the core's outer vessel so that it can be completely emptied.
    - Enabled the ability to extract fuel blocks in use (broken seal) if the reactor is shut down and cold.
    - Adjusted the position of the condenser room surveillance camera.
    - Adjusted the position of the LOADING STATION camera to make it easier to see the truck parked in the loading bay.


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

Patch notes: V 2.2.23.188

The following improvements and fixes were implemented:


    - Fixed bug in steam-water flow balance meters.
    - Fixed the evaporation calculation of the core's outer vessel.
    - Fixed the temperature calculation during a meltdown.
    - Fixed the position of the radioactivity visual effect during a meltdown.
    - Fixed the "Details" field in the Maintenance App to display the full status of the component being repaired.
    - Fixed the brightness of the core access gate lights, which appeared to be on even when there was no power.
    - Fixed a bug in the maintenance report, where it was always displayed with filters applied at the beginning.
    - Fixed an issue where control rods movement was not affected by game speed.
    - Fixed an issue when removing fuses from the fuse box.
    - Fixed a bug where the control rod bank selection keys would play sound even if the volume control was turned down to 0.
    - Fixed bug where control rods were displayed in the wrong position on the power board [2].
    - Fixed visual error when opening or closing the access hatch to the fuel block area.
    - Fixed an issue in the "Uninstall Control Rods" task where the crane would accumulate all the rods in a single container.
    - Fixed an internal issue when attempting to activate primary circuit circulation without circulation pumps.
    - Fixed an internal issue when displaying container status in the maintenance report.
    - Fixed an internal issue when updating battery racks.
    - Fixed an internal issue when attempting to operate uninstalled circulation pumps from the control room.
    - Fixed an internal issue with the position of fuses inside fuse boxes when loading saved progress.
    - Fixed an internal error when loading saved progress with an evaporator or circulation pump under construction.
    - Added details of the cause of the steam turbine damage to the maintenance report.
    - Added a control to the residual steam to prevent damage to the turbines if the pressure is dropping.
    - Added the day and time of the game to the savegame description.
    - Added video surveillance camera to the new genset building.
    - Added video surveillance camera to the chemical room.
    - Added 3D models of security cameras.
    - Added the "Nucleares" industrial sign to the building.
    - Modified steam-water flow balance meters to include condensation values ​​and improve the representation of the balance within the evaporators.
    - Modified the behavior of the open hatch alarm so that it is no longer necessary to turn off the pump that generated the alarm to reset it.
    - Improved the update time of battery rack status lights.
    - Increased the number of display cases for audit awards and moved to the sponsor's room.
    - Renamed and reordered access codes for video surveillance cameras.
    - Redesigned the sponsor's room.


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

Patch notes: V 2.2.23.187

The following improvements and fixes were implemented:


    - Fixed low power bug in circulation pumps.
    - Fixed a bug in the maintenance report where the fuel reserve tank status was not displayed correctly.
    - Fixed the purchase limit for control rods and fuel blocks so that it is not possible to purchase more than the available storage slots [2].
    - Fixed the sound offset when closing lever-type valves.
    - Fixed a bug in the fuse box where flipping the switch would cause the player to receive an electric shock if the fuse was blown.
    - Fixed the translation for the service area.
    - Fixed an internal error when executing hold on the control rods.
    - Fixed an internal error when trying to load saved progress with an invalid Geiger counter.
    - Fixed an internal error when trying to interact with an invalid control.
    - Fixed an internal error in the minimum service requirement event that occurs when the city cuts off the power requirement.
    - Fixed an internal error when disassociating a fuse from a fuse box.
    - Fixed an internal error when processing Boron and Xenon statistics at the time of fission.
    - Fixed an internal error when synchronizing generator sets.
    - Fixed an internal error when loading saved progress with a fuse in the backpack.
    - Fixed an internal error when attempting to repair a deleted, sold, or destroyed electrical transformer.
    - Fixed an internal error when processing queued messages.
    - Fixed an internal bug when restoring light colors when loading saved progress.
    - Fixed an internal bug where the AO position wasn't being restored correctly.
    - Fixed an internal error that occurred when attempting to repair a genset.
    - Added doors to the external structures of the freight pumps.
    - Added a warning message explaining the limits and conditions for purchasing fuel blocks and control rods.
    - Added a purge valve to the fuel reserve tank.
    - Added a tank for disposing of contaminated fuel.
    - Added the decontamination task in AO so it can clean contaminated tanks.
    - Added the new genset room area to the list of areas AO can analyze.
    - Modified Fuel canister storage so that they are stored by default in the new genset room.
    - Reduced the intensity of the dirt on the control room window.

    WEBSERVER

    - Added the function CalculateThermalEnergyFactorChange().
    - Added webserver variable for triggering a SCRAM button press. (Ker Ball One)
    - Added the webserver variables CORE_POOL_COOLANT_TANK_VOLUME, CORE_PRIMARY_CIRCUIT_COOLING_TANK_VOLUME and CORE_EXTERNAL_COOLANT_RESERVOIR_VOLUME.
    - Added the webserver variable CORE_FACTOR_CHANGE, representing by how much the thermal output has changed since the previous simulation cycle (This is similar to the reactivity gauge of the single fuel rod reactor).


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

Patch notes: V 2.2.23.185

The following improvements and fixes were implemented:


    - Fixed an issue where manually operating valve B1 would teleport the player to the middle of the core's outer vessel.
    - Fixed empty fuel tank bug after loading saved progress.
    - Fixed a bug that prevented control rods from being loaded into the core if a fuel block had been previously installed.
    - Fixed an issue where generator sets would not load fuel from the reserve tank in some situations.
    - Fixed an issue where rain was invisible when dynamic lights were active.
    - Fixed an issue where rain was not visible from the exterior cargo area windows.
    - Changed the purchase limit for control rods and fuel blocks so that it is not possible to purchase more than the available storage slots.
    - Added a full date when reporting power outages to avoid confusion when the outage lasts longer than 24 hours.
    - Loading of savegames prior to the new core has been restricted


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

Patch notes: V 2.2.23.184

The following improvements and fixes were implemented:


    - Fixed an internal error that the game generated when the alternate font folder could not be found.
    - Fixed an internal error that the game generated when checking if the player was on fire.
    - Fixed an internal error when executing a hold while moving the control rods.
    - Fixed an internal error in calculating the density of Xenon gas.
    - Fixed an internal error related to updating evaporators.
    - Fixed an error that occurred when attempting to remove an item from the backpack while holding AO.
    - Fixed the issue with missing colliders on the walls of the external supply loading building.
    - Fixed the issue with missing colliders on the external stairs of the main building.
    - Fixed the label identifying the fuel reserve tank loading valve for the generator sets.
    - Fixed the help popup text for the fuel reserve tank fill level gauge.
    - Fixed an bug that prevented generator set analysis from being performed from the tablet.
    - Fixed an bug that prevented the generator set fill level from being displayed in the gauge tooltip.
    - Fixed an bug where the control rods were inserted at 100% after loading a saved progress.
    - Fixed the bug where reserve tanks were contaminated when requesting a refill service for one compound and then another.


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

📢 🏢 New Update – The Diesel Generators Have Their Own Building!

🔋 The Diesel Generators Have a New Home!
In this update, the diesel generators have been moved into their own dedicated building!
Previously, they were located inside the main plant, but now they have a specialized facility built just for them:

🏠 Housed inside a protected, purpose-built structure

🔒 Better defense against external threats, fires, and accidents

🛠️ Easier maintenance, management, and inspections

It’s not just a visual change – it’s a major upgrade in infrastructure realism!

🛻 New: Fuel Deliveries by Truck!
From now on, it's possible to refuel the diesel generators using fuel delivery trucks that arrive at the plant!

🚛 Coordinate deliveries to keep your generators fueled

⛽ Manage fuel reserves carefully during long emergencies

📈 Adds a new layer of logistics and strategy to plant operations

Be sure to monitor your fuel levels – running dry is not an option in a critical situation!

🔥 Keep the Plant Powered No Matter What!
Backup power isn’t just important – it’s critical.
With this update, you’ll experience a much more immersive and strategic emergency management system.

PATCH NOTES:

V 2.2.23.183:

- Fixed a bug that caused the player to freeze in midair when the ALT key was pressed immediately after jumping.
- Fixed a bug that allowed the power demand progression option to be changed while the game was active.
- Fixed an issue where the control rod temperature was too low when the rods were almost completely removed from the core [2].
- Fixed low contrast on some labels inside the containment building when the game had dynamic lights enabled.
- Fixed issue where control rod would disappear from storage after loading a saved game.
- Fixed issue with selectors being in the wrong position after loading a saved game.
- Fixed bug where control rods were displayed in the wrong position on the power board.
- Fixed bug where external power supply would not recover after a power outage.
- Fixed issue where items could not be grabbed from shelves after loading saved progress.
- Fixed an issue with the doors of the resistance banks and battery racks, which could be opened from any distance.
- Fixed an issue with the battery rack door, which was difficult to close once opened.
- Fixed the excessively loud water splash sound when AO gets into the water.
- Fixed a bug that caused the wrong pump to be removed when selling a pump from the tablet app.
- Fixed the temperature calculation inside the evaporator when there is very high pressure.
- Fixed an issue where fuses inside the backpack would disappear when loading saved progress.
- Fixed an issue where extracting a control rod with the crane would not disappear from the control panel.
- Fixed an issue where newly installed control rods would not correctly register their absorption power unless they were moved beforehand.
- Fixed visual issue with ambient shadows flickering in some situations.
- Moved the generator sets from the input room to a new building separate from the plant.
- Added a new connection from the external supply room to the new generator set building.
- Added Fuel delivery service for the generator sets.
- Added a new valve to the external fuel supply room to divert fuel to the new generator building.
- Added a new valve status panel to the external fuel supply room.
- Increased to 30% the limit on the amount of fissile material remaining in a fuel block for extraction.
- Improved advanced ambient reflection shader.

🎮 Update now and explore the new generator systems!
As always, we'd love to hear your thoughts and ideas for future improvements.