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Build your own physics playground in the browser, in real 3D, with a lit wall and a marble that bounces for real.
No install. No login. No AI inside, just physics.
Export it as a 9:16 MP4 with sound when it feels just right.
Built for a desktop browser: the scene is drawn in 3D, so phones and tablets get a short message instead.
Stored locally in your browser.
You have not built anything yet, so there is no run to turn into a video.
It is selected below - press Ctrl+C to copy it.
How it works, the starter templates, keyboard shortcuts and the short answers.
MP4, rendered frame by frame. The result does not depend on how fast your computer is.
Starting…