Released Sep 14, 2026 Early Access $9.99 Mostly Positive Counts toward your Steam games

Nuclear Design Bureau

By Design Bureau KB-11

Simulation Strategy PhysicsCold WarScience Sandbox Puzzle 2D Pixel GraphicsDarkDifficultDestruction

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Reviews 426 Mostly Positive

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Nuclear Design Bureau is a game tagged Simulation, Strategy and Physics by Design Bureau KB-11, released Sep 14, 2026. It has 426 Steam reviews (Mostly Positive). The Steam games most like it include Terra Firma 2, Fantastic Contraption Classic 1 & 2 and Logos Orbit.

Design. Simulate. Detonate. As a junior engineer at the Kurchatov Institute, you design atomic devices to satisfy the demands of the State. A hardcore physics game simulating hydrodynamics, neutron transport, and thermonuclear fusion.

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Terra Firma 2 59% match · Simulation, Strategy, Physics
Fantastic Contraption Classic 1 & 2 57% match · Simulation, Strategy, Physics
Logos Orbit 56% match · Simulation, Strategy, Physics
Skybreaker: Rebuild Protocol 56% match · Simulation, Physics, Sandbox
Water Physics Simulation 56% match · Simulation, Physics, Sandbox
chemistris 55% match · Simulation, Physics, Puzzle
Jingjie: Signals 54% match · Simulation, Strategy, Physics
Laser Attraction 52% match · Simulation, Physics, Science
Stardust Sandbox 52% match · Simulation, Physics, Science
Kachinka 51% match · Simulation, Strategy, Physics

Steam data

Everything Steam lists for Nuclear Design Bureau · record updated 5 hours ago

Steam store

Overview

App ID4190240

Release dateSep 14, 2026

Last change number40196171

Last record update5 hours ago

App type: Game
Developer: Design Bureau KB-11
Publisher: Design Bureau KB-11
Steam profile: Counts toward game count and achievement totals · checked 1 day ago

Windows

Steam Deck: Unsupported

Single-playerSteam AchievementsSteam CloudFamily Sharing

Prices

Price · US$9.99

On sale0 of 41regions right now

Lowest seen · US$9.99Oct 23, 2026

Checked5 hours agoin 41 regions

Philippines₱PHP

Every price change is kept from Oct 23, 2026 on. Pick a region below to compare.

Patches

Build	Branch	Updated
26175850	public	Oct 24, 2026
26122783	previousbuild	Oct 22, 2026

Depots

ID	Name	Systems	Size	Download	Manifest
4190241	—	All	910.0 MB	670.5 MB	231819740695169289

Branch	Build	Updated	Access
public	26175850	Oct 24, 2026	Open
previousbuild previous build in case anything breaks	26122783	Oct 22, 2026	Open

Configuration

Install foldersteamapps/common/Nuclear Design Bureau

Executable	Arguments	Systems	Description
Nuclear Design Bureau.exe		Windows · 64-bit	Play Nuclear Design Bureau

Space per player238.4 MB

Filesup to 100

Save locations0

Achievements

Achievements373 hidden

Most unlocked92.5%State Servant

Rarest0.5%APFSDS

State Servant Complete your first directive. 92.5%
Critical Mass Reach a confirmed k-effective of at least 1.0. 89.1%
Unstoppable Chain Reach a confirmed k-effective of at least 1.2. 88.7%
First Light Initiate your first nuclear chain reaction. 88.5%
Hero of Labor Consume at least 20% of the initial fissile inventory in one run. 56.1%
Hydrogen Age Produce at least 0.10 kilotons of fusion yield in one run. 53.1%
Precision Engineer Complete Compression Qualification. 52.7%
The Fizzle Start a supercritical chain reaction that ends below 0.05 kilotons. 49.6%
Megaton Club Reach 1 Megaton total yield. 49.5%
Cold Warrior Complete 10 Directives. 40%
King of Bombs Complete the final Tsar Bomba directive. 28.5%
No Plutonium More than 10 kt from a uranium implosion with no plutonium. 4.8%
One Channel More than 10 kt from one detonator. 3.8%
Composite Core More than 20 kt from a plutonium and U-235 core. 3.7%
Il-28 Payload More than 5 kt from a device under 75 kg. 3.7%
406 mm More than 5 kt from inside a 406 mm shell. 3.4%
Demolition Charge Between 10 and 100 tons from a device under 50 kg. 3.3%
Salvaged Casting More than 20 kt from the reject casting as delivered. 2.7%

All 37 achievements

Interceptor Between 30 and 60 kt from a device under 250 kg. 2.5%
Provincial Plant More than 10 kt with PBX only and no generator. 2.5%
Prompt Critical Peak k above 1.5 from at most 6 kg of fissile metal. 2.3%
T-5 Torpedo More than 3.5 kt from inside a 533 mm torpedo. 2.3%
R-5M Nose Cone More than 10 kt from inside a missile nose cone. 2.2%
Compression Record Bulk Fissile Density above 1.8 with more than 8 kg of plutonium. 2.1%
Prompt Critical II Peak k above 1.7 from at most 9 kg of fissile metal. 2.1%
Light Charge More than 5 kt from a device under 50 kg. 2%
Parachute Container More than 10 kt from inside a 700 mm container. 2%
Lightest Kiloton More than 1 kt from a device under 25 kg. 1.9%
Clean Charge More than 400 kt, under a quarter of it from fission. 1.9%
Plutonium Economy II More than 7 kt from each kilogram of fissile metal. 1.8%
Plutonium Economy More than 4 kt from each kilogram of fissile metal. 1.7%
One-Point Safe Full yield as built, under 1 ton from one detonator. 1.2%
Selectable Yield Three yields from one device, changing only the generator time. 1.1%
Special Orders Closed Complete every Special Order in the register. 0.8%
APHE Hidden achievement 0.7%
HEAT-FS Hidden achievement 0.6%
APFSDS Hidden achievement 0.5%