Tilt the board and every marble rolls at once. Guide each marble into the hole of its own colour while walls, pits and later mechanics change the route.
Swipe up, down, left or right to tilt the board. Every marble rolls that way until something stops it. Get every marble into its matching hole.
Plumb was submitted to SlowDen by Chaosmos. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-11-13. It runs in the browser with no download, no install and no sign-up.