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falling sand

A free sandbox game — play it in your browser, no install. An entire falling-sand physics playground in a single HTML file — sand, water, lava, fire, plants, gunpowder, acid. No build, no dependencies, 60fps.

by @ssmurfgg04-gif · ssmurfgg04-gif/falling-sand on GitHubLANG HTMLHOSTED ON SSMURFGG04-GIF.GITHUB.IOUPDATED 7 Sep 2026

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Controls: drag to draw with the selected material · right-drag: erase

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From the README

An entire falling-sand physics playground in one HTML file. No build. No dependencies. No framework. Save index.html, double-click it, and you're pouring lava.

Pick scene: volcano, poke the crater with fire, and enjoy the show. There is gunpowder buried in the mountain. Finding it is your problem.

Works with touch. Everything runs locally — nothing is loaded, tracked or sent anywhere. You can even draw while paused, if you like building dioramas before the physics starts.

Read the full README on GitHub →

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