Players now
#3,53052
▲ 40.5%vs 24h ago · updates every minute
Last 7 days
Screenshots, achievements, specs, every price change and sale we've seen on Steam, and trading cards.
Loading from Steam…
Steam prices for United States (change the country in the top bar), and Steam keys from authorized stores.
Checking other stores…
Loading from Steam…
78% positive of 441 · Mostly Positive · Live from Steam
Loading reviews from Steam…
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.
Live data from Steam, tracked by SteamPlayerBase.
What changed on Steam for this game since we started following it: prices and sales, builds, name, release date and review score.
Review score: 78% on 2026-11-02 → 78% today (441 reviews)
No authorized Steam key store lists this game right now.
Games we track that share the most Steam tags with this one.
Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.
Changed: Shared content (1 download)
previous build in case anything breaks
Changelog Stuck or lost progress Fixed Directive 1-2 not moving on when casing steel was missing. The missing cells are now marked red Fixed Directive 2-2's lens step not saying what is missing. The guide turns green when the lens is right Fixed Restart campai…
Changelog fixed no way to reach the next directive after First Light REGISTER now works in the 3D view Petrov's lesson lines no longer wait for a click fixed Directive 1-3 not finishing with Mirror on the board says why when FILL AIR or REPLACE places nothing …
Changelog: simulation run a little faster F12 saves a screenshot to your Steam library with the overlay off, and the key can be moved Petrov's panel can be dragged, and it no longer covers what a step needs fixed Directive 2-2's first circle not placing Direct…
Changelog:fixed First Light not finishing after the 3D view unless you clicked Petrov's last linenew Seed option in Sandbox, the die key next to k at rest or Seed in the right-click menufixed gunpowder causing different yields each time on the same seedafter T…
Changelog: fixed the three hidden achievements never unlocking. They are now checked when you press RESET new icons for the 11 original achievements fixed Directive 1-3 getting stuck after a restart. board is saved as "Board from Proving Ground" fixed Skip on …
Changelog: fixed designs going missing from the clipboard history. Designs lost before this fix can't be brought back the game now keeps a copy of a save it can't read before it starts fresh fixed Selectable Yield shots not counting when the pit went off befor…
Does not work on Steam Deck. Results from Valve's own testing.