Sandboxels

Sandboxels is a falling-sand playground where you are the scientist, the arsonist, and the god of a tiny pixel universe — sometimes all three in the same minute. Pick from over 500 elements, drag them onto the canvas, and watch fire melt ice, lightning fry water, and plants overrun everything. There is no score, no timer, and no wrong answer. Just curiosity and beautiful chaos.

What Is Sandboxels?

Sandboxels is a free, open-source falling-sand simulation created by developer R74n. “Falling sand” is a genre where every single pixel on the screen is simulated: sand piles up, water flows, fire spreads, and electricity jumps between conductors. It takes that idea further than almost any other game in the genre, with heat simulation, density, pressure, and thousands of chemical reactions between its 500+ elements.

The whole point is experimentation. The game hands you the building blocks of a tiny universe and asks one question: what happens if you mix this with that? Sometimes the answer is boring. Sometimes it is a mushroom cloud. That is the fun.

The browser version is completely free and needs no account. There is also a paid version on Steam with extra perks like workshop support and no ads, but everything in this guide works in the free browser game.

Your First 5 Minutes

1. Pick a category. The element menu at the bottom is organized into families like Liquids, Powders, and Energy. Click “Liquids,” then click “Water.”

2. Paint the canvas. Drag your mouse across the screen. Water pours out of your cursor and pools at the bottom, flowing around like the real thing.

3. Add something dangerous. Switch to the Energy family, pick “Fire,” and drag it through your water. Watch the water turn to steam — your first chemical reaction.

4. Try the opposite. Erase the mess (there is an eraser tool in the menu), paint a pile of sand, and drop fire on that instead. Very different result.

5. Learn the pause button. When things get chaotic, pause the simulation, set up your scene carefully, then unpause and watch it unfold. Builders live by this button.

That is the whole tutorial. Everything else in Sandboxels is just fancier versions of “paint pixels, watch them react.”

The Element Families

Powders and solids. Sand, salt, dirt, wood, metal, glass — the building materials. They pile, stack, and hold their shape. Build your volcanoes and castles out of these.

Liquids. Water, oil, acid, lava, and stranger stuff. They flow, pool, and mix. Oil floats on water. Acid eats through almost anything. Lava sets the world on fire.

Gases. Steam, smoke, hydrogen, and more. They rise, drift, and spread. Hydrogen plus a spark is exactly as bad an idea as it sounds.

Energy. Fire, electricity, plasma, and radiation. These do not sit still — they transform everything they touch. Use them as the match that starts every experiment.

Life. Seeds, plants, algae, and fungi. Plant a seed in dirt, add water, and watch a forest grow. Then add fire, because you are only human.

Tools. The eraser, wind, heaters, coolers, and cloning tools. These are how you control the chaos instead of just causing it.

7 Experiments Worth Trying Tonight

1. Build a volcano. Stack rock into a cone, fill the crater with magma, and wait. The eruption is slow, glowing, and weirdly relaxing to watch.

2. Summon a thunderstorm. Paint a band of clouds across the top of the screen, add rain, then zap the clouds with electricity. Lightning, downpour, and drama.

3. Grow a forest, then burn it. Lay down dirt, scatter seeds, add water, and watch trees sprout. Admire your ecosystem for a full minute. Then introduce fire and watch nature’s reset button.

4. Make acid rain. Fill clouds with acid instead of water. Whatever is underneath will not be there for long. Try it over a little stone statue you built.

5. Freeze the lake. Fill the bottom of the canvas with water, then hit it with extreme cold. Skate-worthy ice in seconds. Now drop something hot on it and watch it crack.

6. Cook dinner. The game has a cooking system: place an egg near heat and it actually cooks. Build a tiny kitchen and see how many foods you can prepare.

7. Go nuclear. Save this one for last. Place the nuke element, add a spark, and stand back. It is the fastest way to learn why the eraser tool exists.

Save and Share Your Creations

Once you build something worth keeping — a working ecosystem, a Rube Goldberg chain reaction, a pixel-art masterpiece — save it to one of the game’s save slots. You can reload it anytime, tweak it, and save new versions. The best players treat their saves like a sketchbook: every wild idea gets saved, and the good ones get rebuilt bigger.

The Steam version even lets you publish creations to the workshop for other players to try, but the browser saves are plenty for experimenting. Pro tip: save BEFORE the nuke experiment, not after.

Quick Questions

Is Sandboxels free?

Yes. The browser version on the official site is completely free and open source. A paid Steam version exists with extras like workshop support and no ads.

Who made it?

It was created by developer R74n and is open source, which is why the community keeps adding new elements and features.

How many elements are there?

Over 500 unique elements, from everyday materials like sand and water to exotic ones like plasma, acid, and nukes — with thousands of reactions between them.

Can I play on my phone?

Yes. The browser version works with touch controls — tap a category, pick an element, and drag on the canvas.

Can I save my creations?

Yes. The game has save slots so you can store your best scenes and reload them later. Save before running destructive experiments.

What is a falling-sand game?

It is a simulation genre where every pixel behaves like a tiny particle of matter. Sand piles up, liquids flow, gases rise, and fire spreads — all calculated live, pixel by pixel.

Your Turn

That is your starter kit for Sandboxels — the element families, seven experiments, and the save system. Hit Play above, open the official page, and start mixing.

What is the wildest reaction you have created — a working volcano, a thunderstorm, or total nuclear chaos? Tell us in the comments. Bonus points if you saved it.