Reactonix is a flexible and enjoyable simulation sandbox where every force is at your command. Create ecosystems alone or with friends, experiment with physics and watch life evolve—or start an apocalypse for the sake of science. Complete freedom to create and destroy is in your hands.

Welcome to Reactonix!<h2 class="bb_tag" >Create your own worlds—or leave nothing but ashes!</h2><ul class="bb_ul"><li>A wealth of tools. Materials, living creatures, forces of nature and much, much more are in your hands. What happens to the world is up to you.P.S. Most importantly, don't try at home what you do in the game! (=<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/7e709d5187ec08bee16cee7b4bcbb531.poster.avif?t=1761922281" width=800 height=58 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/7e709d5187ec08bee16cee7b4bcbb531.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/7e709d5187ec08bee16cee7b4bcbb531.mp4?t=1761922281" type="video/mp4"></video></li><li>Forces of destruction. After all, who doesn't need a little fire for fun now and then?<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ec36a8a961991a1a6b56218fd6686714.poster.avif?t=1761922281" width=800 height=450 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ec36a8a961991a1a6b56218fd6686714.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ec36a8a961991a1a6b56218fd6686714.mp4?t=1761922281" type="video/mp4"></video></li><li>Life — from familiar to alien. From ordinary plants to unimaginable beings and an evolutionary life system that depends on environmental conditions.<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/36258d0ccdbfb32031e141c6cff884ba.poster.avif?t=1761922281" width=800 height=450 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/36258d0ccdbfb32031e141c6cff884ba.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/36258d0ccdbfb32031e141c6cff884ba.mp4?t=1761922281" type="video/mp4"></video></li><li>Physical processes. Detailed simulation of natural phenomena, down to the ability to control individual cells.<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/5933f5d215bde18e07e53d22d7c847e7.poster.avif?t=1761922281" width=800 height=450 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/5933f5d215bde18e07e53d22d7c847e7.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/5933f5d215bde18e07e53d22d7c847e7.mp4?t=1761922281" type="video/mp4"></video></li></ul><h2 class="bb_tag" >Don't be alone!</h2><ul class="bb_ul"><li>Co-op. Invite friends into your world or join theirs to create and destroy together! Or maybe, not entirely together... (=<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/a8556e99eb345871533a46234e68c707.poster.avif?t=1761922281" width=800 height=450 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/a8556e99eb345871533a46234e68c707.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/a8556e99eb345871533a46234e68c707.mp4?t=1761922281" type="video/mp4"></video></li><li>Workshop. Share your worlds and recorded statistics with the community!</li><li>Mod support. The game includes tools for integrating mods into many parts. Create new tools, materials, processes—or something bigger—if you want!</li></ul><h2 class="bb_tag" >More than just sight!</h2><ul class="bb_ul"><li>Multiple view modes. Is it boring to look at the world with only your eyes? Observe temperature, creatures and other processes separately!<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/cad43cd146213705b517c9ffe503d558.poster.avif?t=1761922281" width=800 height=450 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/cad43cd146213705b517c9ffe503d558.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/cad43cd146213705b517c9ffe503d558.mp4?t=1761922281" type="video/mp4"></video></li><li>Statistics. Ever wanted to feel like a scientist? Now you can rely not only on your eyes but also on numbers and charts!<video class="bb_img" autoplay muted loop playsinline poster="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ccb8ab951cd00fe1886adf2e771c673c.poster.avif?t=1761922281" width=800 height=644 ><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ccb8ab951cd00fe1886adf2e771c673c.webm?t=1761922281" type="video/webm; codecs=vp9"><source src="https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/3426670/extras/ccb8ab951cd00fe1886adf2e771c673c.mp4?t=1761922281" type="video/mp4"></video></li></ul>And remember, EVERYTHING here is under your control! (Unless your friends get in the way. (= )

Good Game Database

Reactonix Sandbox Achievements