Sandboxels is the free falling-sand physics sandbox — paint 550+ sandboxels elements on the canvas. Heat, chemistry and ecology react in real time, right in your browser.
Six pillars hold every Sandboxels simulation together. The sandboxels engine runs heat, density and reactions at 30 TPS — no matter how chaotic the scene gets.
Powders, liquids, gases, life forms, machinery, food, weapons and more — each with its own density, temperature and behaviour.
Sandboxels uses a custom cellular-automaton engine for heat transfer, density, fluid dynamics, combustion and electricity at 30 ticks per second.
Wire batteries to lamps, build clocks with logic gates, or fry your own contraption with a thunderbolt. Electricity flows like the real thing.
Seeds sprout, fish swim, ants forage, viruses spread. Build self-sustaining biomes and watch evolution play out at pixel scale.
Drop in any community mod with one URL. Read the docs and ship your own element in 50 lines of JavaScript.
Installable PWA, mobile-first controls, offline cache. No store, no signup — just a tab in your browser.
Land, Liquids, Life, Energy, Weapons, Food, Gases — eleven curated categories above the Sandboxels canvas.
Click, drag or tap to paint. Shift+click draws straight lines, scroll changes brush size.
Heat, cool, drag, mix or shock the scene with the tools panel. Save your favourite scenes locally or share them.
Sandboxels is a free, in-browser falling-sand sandbox where every pixel obeys real physics. Drop a single grain of sand, a drop of magma or a spark of electricity and watch hundreds of sandboxels materials react in real time — no installation, no signup, no limits.
With over 550 unique sandboxels elements, the simulator threads together heat transfer, electricity, density, chemistry, ecology and cooking into one cohesive playground. Build a working circuit, grow a forest, brew an explosion — the possibilities are emergent and endless.
It also doubles as a classroom: teachers use Sandboxels to explain phase transitions, chemical reactions, food webs and even epidemiology — hands-on, visual and immediately rewarding.
Essential Sandboxels shortcuts below. See the full controls guide for every key and gesture in the sandboxels simulator.