Marble Rail

Design height-aware marble runs on a 2D grid.

Feedback

Build a race or flowing marble run.

Place rails, splits, merges, and Dr/Ad drops, then launch Race or Flow and share the exact course.

How it works

Use one Start and at least one Goal; connect rails across the 20x12 grid.
Use Dr/Ad to change height; warnings show open or conflicting connections.
Preview the course, start a red-blue Race, or run Flow with a dense launch gap.
Export a share URL to reproduce the exact layout and playback settings.

Part guide