Unstable Nuclear Reactor combines incremental progression with hex-based puzzle mechanics, tasking you with merging atomic elements to manage an overheating reactor. Each run introduces fresh layouts and element combinations, rewarding both strategic planning and quick decision-making as you work against escalating pressure. Fans of both roguelite variety and meditative puzzle games will find plenty to engage with here.
About this game
An incremental hex-puzzle roguelite game where merging atomic elements prevents a nuclear meltdown.
Players, last 67 days
Peak 0 · Low 0
Daily peak concurrent players, sampled once a night from Steam.
As always, I’m listening to your feedback and doing my best to improve the overall experience and make the game more fun and challenging. WHAT CHANGED?Smart Merge Indicators! You no longer have to guess! When you're holding an Atom, Fusion tool, or Neutron tool, the board will now automatically highlight the exact empty hexes where placing it will trigger a successful merge. 🚀 A Huge Thank You!We recently crossed 600+ 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!
For the past seven months, I’ve been working on this project completely solo. During development, I conducted extensive playtesting with over 10,000 players across various WebGL platforms to refine the core gameplay. WHAT CHANGED?Based on tough feedback regarding harsh RNG and a lack of tutorials, I reworked the core experience by introducing:Hold Slots: Store up to 5 atoms or tools to use when needed. If you need to clear space, you can discard an item by spending a few Radioactive Coins.Equip / Unequip Tools: Gain full control over your loadout by toggling unlocked tools on or off during gameplay.Additionally, I implemented better tutorials, improved the upgrade system UI, and fixed several bugs! 🚀 A Huge Thank You!We recently crossed 500+ 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!
🚀 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!
Posts come from Steam's official announcements feed.
