
Screenshots

Watch trailer on Steam ↗Reactor 13
Vaaran Game Studio · Published by Vaaran Game Studio
Last updated 28 Sept 2026
Reactor 13 is chaotic local co-op for 1–4 players. Grab, wash, charge, and craft Dark Matter blocks to power everything from one house up to a whole planet. Overcharge for huge output; the chain reactions are half the fun, the meltdown is not. Play solo or have someone else to blame.
Action, Indie, Casual · 2027 · More free games
About this game
Reactor 13 is chaotic local co-op for 1–4 players. Grab, wash, charge, and craft Dark Matter blocks to power everything from one house up to a whole planet. Overcharge for huge output; the chain reactions are half the fun, the meltdown is not. Play solo or have someone else to blame.
Wash the Dark Matter
Dirty ore hides its color. You cannot craft blocks you cannot tell apart.
Craft it, then craft it again
Craft same-color blocks into something better. Then do it again. Each color does a different job in the reactor.
The reactor does not feed itself
Wash, charge, craft, feed. Split the work across the crew, or run it all yourself.
Push it too far
Chain reactions may blow up all your blocks, or none of them. Always someone's fault.
Key Features
Local co-op for 1–4 players on one screen. Single player works too.
Keep every job running: wash, charge, craft, feed.
Craft same-color blocks into better ones. Each step raises output more than the last.
Charge any block for more output. Overcharge past the safe limit and it may set off the next one, and the next, or nothing at all.
Red is fuel: more speed, more heat. Blue is coolant and brings the heat back down. Green cuts friction, so the reactor runs cooler and produces more.
No HUD. The gauges on the wall are the only instruments in the building.
Output is the score. The higher you climb, the harder the balance. A meltdown ends the run for everyone.
Coming soon
A Steam Playtest is coming. Wishlist now so you don't miss the Playtest.
System Requirements
Will my PC run this? →Minimum
- Requires a 64-bit processor and operating system
- OS: Windows 10 64-bit
- Processor: Intel Core i5
- Memory: 8 GB RAM
- Graphics: NVIDIA GeForce GTX 1660 / RTX 2060 / AMD Radeon RX 5600 XT
- DirectX: Version 12
- Storage: 6 GB available space
Recommended
- Requires a 64-bit processor and operating system
- Memory: 16 GB RAM
- DirectX: Version 12
- Storage: 6 GB available space
Supported Languages
Latest news
Patch NotesOfficial
Reactor 13 - September Developer Update
We’re working towards our Playtest build, and here is a quick look at the new result screen. After each shift, your crew lines up in front of the reactor for a report: your overall score, stars, and a breakdown of the jobs completed. It is a moment to celebrate before heading into the next meltdown.More gameplay is coming in October’s update, including some updated mechanics.Wishlist Reactor 13 to follow development.Read full article on Community Announcements (teemu)






