A downloadable pair of games for Android

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ReactionLab 1 & 2 Bundle

ReactionLab 1 and 2 are pixel-based particle sandbox games for Android. Draw elements onto the canvas and watch them interact in real-time! Build simple machines and share creations online.

With over 80 elements, hundreds of different particle types, and nearly 140 achievements to attain. There are endless creative possibilities and undiscovered combinations. Try to find every reaction, or just build something awesome; it's up to you!


  • Massive reactions list and over 80 elements
  • Freely pause and rewind time
  • Zoom tool with minimap
  • Save creations locally or share them with others online
  • Surprising amount of depth to the game. Many hours worth of content to discover.
  • Infinite replayability
  • No ads or in-app purchases
  • Offline friendly
  • Tiny 1MB install size

Originally released in 2014, both games have been extremely popular on Android. Nowadays, due to their age, most devices can no longer install them from Google Play (an unfortunate Google policy change).  As a result, both games are now available as a bundle on itch!

Additional Notes:

  • (New) ReactionLab 1 & 2 might not be installable on Android 14 and up, as Google now blocks installation of old apps. Your mileage may vary.
  • In general, I no longer maintain these games, though lots of people still play! I'm committed to keeping the servers running indefinitely.
  • Pay what you can for both games. Please consider a donation if you enjoy them. Revenue helps cover server costs and supports future projects ❤️
  • Finally, I'd recommend jumping straight into ReactionLab 2, as it improves on the original in nearly every way. Consider ReactionLab 1 to be an extra bonus if you'd like to see the game's roots.

Happy experimenting!


Download NowName your own price

Click download now to get access to the following files:

ReactionLab 1 - v1.1.5.apk 1 MB
ReactionLab 2 - v1.6.0.apk 956 kB

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