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4K |
Play game
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Plays
3,453
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Ratings
22
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Favorites
3
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Published
Jul 9, 2026
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After five months of solo development, the official Unstable Nuclear Reactor free demo is finally live (Supports 13 languages).
Unstable Nuclear Reactor is an incremental hex-puzzle roguelite where you merge atomic elements to prevent a nuclear meltdown.
Merge atoms into higher elements through standard merges or massive chain combos. Earn radioactive coins to unlock powerful upgrades, expand your reactor with new rings, and carefully manage your limited capacity to keep the reactor working.
Wishlist on Steam: https://store.steampowered.com/app/4644400/Unstable_Nuclear_Reactor/
Discord: https://discord.gg/7DUx9zTanf
Press Kit & Trailers: https://drive.google.com/drive/folders/1WFBRkRjWsdcyGdlISMvo4NoiRm5HnEBs?usp=sharing
Demo Play Modes:
P.S. For content creators and streamers: It would be an honor to see Unstable Nuclear Reactor featured in one of your videos or livestreams. Feel free to reach out, and all promotional assets are available in the press kit above.
🚀 New Feature: The Hold Inventory (5 Slots Max!)
We heard your feedback regarding early-game gridlock and late-game RNG stress loud and clear! To give you way more strategic control over your reactor, we’ve introduced the Hold Slots system.
Visual Guide & UX Polish: When you hover over an atom, all identical atoms on the ring will shake so you can locate matching pairs instantly. To fix the issue where these shaking animations became hard to spot when zoomed out, we’ve added a vibrant yellow glowing hex background behind each matching atom. Finding your next merge is now effortless at any zoom level!
Just use the left mouse button to click, and the scroll wheel to zoom in and out.
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