Marble Run 3D is a free browser marble race game. Every track is procedurally generated — rails, funnels, jumps — then verified completable by an offline physics pass before you ever see it, so no run is a dead end. Watch the marbles roll, crash and photo-finish. No download, no signup: it runs right in your browser on desktop or mobile.
📜 The prompt (creator shared how it was made)
Build a single-file three.js + cannon-es marble run: procedurally generate a track with rails, funnels and jumps, then verify it is completable with an offline physics pass before showing it. Add a chase camera and satisfying rolling physics.