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Nuclear Design Bureau is a hardcore sandbox engineering game where you design and test nuclear devices. You are a junior engineer at the Kurchatov Institute. The State gives you a target and a warehouse full of dangerous materials. Some directives limit what you are allowed to use. Your job is to build a device that does what the directive asks.
PC (Microsoft Windows) · Sep 15, 2026
Worldwide · Exact date · Early access · IGDB
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11 achievements available.
Complete 10 Directives.
LockedSteam
Reach a confirmed k-effective of at least 1.0.
LockedSteam
Consume at least 20% of the initial fissile inventory in one run.
LockedSteam
Initiate your first nuclear chain reaction.
LockedSteam
Start a supercritical chain reaction that ends below 0.05 kilotons.
LockedSteam
Produce at least 0.10 kilotons of fusion yield in one run.
LockedSteam
Reach 1 Megaton total yield.
LockedSteam
Complete Compression Qualification.
LockedSteam
Complete your first directive.
LockedSteam
Complete the final Tsar Bomba directive.
LockedSteam
Reach a confirmed k-effective of at least 1.2.
LockedSteam
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