Screenshots
Watch trailer on Steam ↗Unstable Nuclear Reactor
Ali Boukeroui · Published by MXSGames
Last updated 28 Sept 2026
An incremental hex-puzzle roguelite game where merging atomic elements prevents a nuclear meltdown.
Indie, Strategy, Casual · 2026 · More free games
About this game
An incremental hex-puzzle roguelite game where merging atomic elements prevents a nuclear meltdown.
EASY TO LEARN, HARD TO MASTER
Merge atoms into higher elements through standard merges or massive chain combos, earn radioactive coins, and manage your ring capacity efficiently to keep your reactor running at peak performance. 🚀⚛️
UPGRADE YOUR SYSTEM
Invest your radioactive coins in powerful upgrades, unlock new tools, expand your reactor’s potential, and push your runs further than ever before.
POWER UP YOUR TOOLS
Unlock +20 powerful tool upgrades to boost your efficiency, amplify your combos, and take your reactor to the next level.
System Requirements
Will my PC run this? →Minimum
- OS *: Windows 7 or newer
- Processor: 2.5Ghz or better
- Memory: 2 GB RAM
- Graphics: 500 MB available space
Recommended
- Memory: 4 GB RAM
Supported Languages
Latest news
AnnouncementsOfficial
☢️ DEMO IS OUT NOW! Play Unstable Nuclear Reactor 🚀
🚀 I’m thrilled to announce that the demo for my game is now live! 💫For the past 5 months, I’ve been developing this project completely solo. Throughout development, I conducted extensive playtesting with over 500 players across itch and various WebGL platforms to refine the gameplay experience. Demo Features⚛️ Orbital Survival Mode – A unique 7-ring orbital challenge where you must manage steadily decaying reactor energy.⬡ Survival Mode (Hexagon) – A classic 7-ring hexagonal grid focused on long-term strategy and endurance.🌿 Relax Mode (Hexagon) – A pressure-free experience with no energy drain or time constraints.⏱️ Estimated playtime: 60–120 minutes of strategic puzzle-solving and reactor management.I'd love to hear your feedback and see how long you can keep the reactor stable! ☢️🔥 🚀 A Huge Thank You!We recently crossed 390+ wishlists, which is an incredible milestone for this solo developer journey. Your support, clicks, and hype keep this reactor running! If you haven't yet, please hit that Wishlist button and share the game with your favorite puzzle and strategy game friends, it helps the Steam algorithm more than you know!Read full article on Community Announcements (mixerstudiosgames)AnnouncementsOfficial
Unstable Nuclear Reactor Demo Launches June 22! ⚛️🎉
Hello Atoms!I have some massive news to share with you all today.The official Unstable Nuclear Reactor Demo has officially cleared Steam's review process and is completely approved for release! All three green lights are lit, and the countdown has officially begun.📅 Official Demo Release Date: Monday, June 22, 2026🔬 Features Included in the Demo:Combo Chain Reactions: The baseline puzzle mechanics allowing you to drop elements, trigger atomic combinations, and watch high-scoring combo chain reactions ripple across the hex grid.Grid Expansion Loops: Progress through the board by achieving a targeted number of element merges to unlock new outer rings and expand your building area.Skill Tree Progression: Earn points from your successful merges to upgrade your reactor systems and unlock permanent tools to help manage the grid and control higher-tier element combos.Roguelite Mechanics: Push your reactor to its limits in run-based gameplay where you adapt to escalating difficulty, test different upgrade paths, and see how long you can survive.🚀 A Huge Thank You!We recently crossed 360+ wishlists, which is an incredible milestone for this solo developer journey. Your support, clicks, and hype keep this reactor running!Make sure your notifications are turned on, and get ready to download and play the free demo this Monday, June 22.If you haven't yet, please hit that Wishlist button and share the game with your favorite puzzle and strategy game friends, it helps the Steam algorithm more than you know!See you on launch day,Mixer Studio GamesRead full article on Community Announcements (mixerstudiosgames)
