A falling-sand sandbox with hundreds of elements that burn, melt, freeze, grow and react, all running in your browser.

Yes. Sandboxels is free to use, with no paid plan.

Sandboxels: Free Falling Sand Game

What is Sandboxels?

Sandboxels is a falling-sand game made by R74n in 2021. You pick an element from a menu and paint it onto the screen, pixel by pixel, then watch what happens. Sand piles up, water flows, fire spreads, metal conducts electricity and plants grow, and different elements react when they touch.

With hundreds of elements, plus heat simulation and electricity, the fun is in experimenting: build a volcano, flood a city of dirt, or see what happens when you mix two things that should not be mixed. In February 2026 it moved to a new home on neal.fun, where Neal Agarwal gave it a fresh dark look, a redesigned settings menu and an intro for new players. The old sandboxels.r74n.com address now redirects there.

What You Can Do

Paint with hundreds of elements, from sand and water to lava and plants
Watch elements react, burn, melt, freeze and grow
Simulate heat and electricity
Build structures and then destroy them
Play right in the browser with no download

How to Play Sandboxels

Open neal.fun/sandboxels.
Choose an element category and pick an element.
Click or drag on the canvas to place it.
Add fire, water or heat and watch how things react.

Is Sandboxels Free?

Sandboxels is free to play with no account or purchases. Neal.fun has an optional tip jar.

Who Will Enjoy It?

Fans of classic falling-sand and sandbox games
Kids who like experimenting and making a mess
Science lovers curious about reactions and states of matter
Anyone who wants an open-ended toy with no goals

Websites Like Sandboxels

Infinite Craft: Another Neal.fun sandbox, where you combine elements to discover new ones.
WebGL Fluid Simulation: A colourful physics toy you can play with for hours.
Line Rider: A classic browser toy for building and watching physics play out.