Reactor

⚗️ Reactor: the particle sandbox where every pixel reacts

Pour sand and water, light a fire, set off some gunpowder or build a tiny nuclear reactor. In Reactor you pick a material, draw it on the screen and let physics do the rest. No levels, no scores — just you, 120+ materials and endless reactions to discover.

🧪 120+ MATERIALS

Powders, liquids, gases, solids, metals, chemicals, plants and radioactive elements — each with its own weight, temperature and behaviour.

🔥 PHYSICS & REACTIONS

• Hot and cold: water freezes, boils and turns to steam; lava cools into rock

• Fire spreads, burns wood and melts metal

• Electricity flows through conductors and lights up neon

• Magnetism, radioactivity, explosions and shockwaves

• Mix elements to make salt, acids, gases and new substances

• Plant seeds, grow plants and watch life unfold (and its enemies!)

👀 7 WAYS TO SEE THE WORLD

View the scene by colour, temperature, wind, magnetism, radioactivity, light or electric current.

🎮 FEATURES

• Adjustable brush and 5 detail levels

• Glow and lighting effects

• Relaxing background music

• 10 save slots + a "map seed" to share your creations with a code

• Two players in the same world (direct connection, no server)

• Guided tutorial, quick material search, undo/redo

• Available in English and Italian

✅ Free and clutter-free. Works offline.

A little physics-and-chemistry lab in your pocket: perfect for experimenting, relaxing, or just blowing something up.

Have fun! 💥