How to play Plumb: the rules in two minutes
Learn to play Plumb, the marble tilt puzzle: swipe to tilt the board, every marble rolls at once, and each one must drop into the hole of its own colour.
The Plumb blog
Tips, strategy and how it's made
How to play, how to find the perfect route, and what goes into a puzzle game built by a two-person team.
Seven beginner tips for Plumb
Seven practical tips for new Plumb players: read the walls first, count what moves, park marbles, and use undo to learn a board fast.
Calm by design: why Plumb has no timers, lives or energy
Plumb has no timers, no lives and no energy, and no ad ever interrupts a puzzle. Why we built a game that respects your time, and what that means in it.
How Plumb levels are made: a generator, a solver, no repeats
Behind the scenes: how Plumb's levels are generated, proven solvable, checked so no two are alike, and ordered so the game never gets easier.
How Plumb's hint works, and when to use it
Plumb's hint previews your best next tilt right on the board: ghost marbles, dotted trails and pit warnings. Here is what each part means.
Made by two: a human and an AI building a puzzle game
Plumb is made by a two-person team: Shravan Goswami and Claude Opus 5.5, an AI model. How the work is split, and what it is like.
Pits, undo and restart: how to play Plumb without fear
Square pits swallow any marble in Plumb, but a mistake costs you one tap. How pits work, what undo and restart do, and why there are no lives.
How to get three stars in Plumb: par, explained
What par means in Plumb, how stars are scored, and a simple method for finding the perfect route on any level, with a worked example.
Why four directions go so deep: the maths of tilting
Plumb has only four moves, yet late levels take a dozen tilts to solve. How one swipe moving every marble creates a huge space of positions.