Marble Sort! has two ways to play: a calm tube-sorting puzzle and a fast conveyor challenge. Both are about getting every marble to the right place.
Tap a tube to lift its top marble, then tap another tube to pour it. A marble can only land on a marble of the same color or in an empty tube. Matching marbles stacked on top move together when there is room. Fill each tube with four marbles of one color to clear the level.
Marbles roll along a belt toward the edge. Tap the bin that matches the first marble in line before it falls off. Every correct sort grows your combo chain, and every five in a row raises the score multiplier. A wrong bin or a missed marble costs one of your three hearts.
Stuck in a puzzle? Undo any number of moves, restart, ask for a hint, or add one extra empty tube. You start with three hints and one extra tube and earn one more of each every five wins. Solve a level without help and in few moves to earn three stars.
Yes. All 120 classic levels were checked by a solver, so there is always a way to finish from the starting layout.
The game tells you when no moves are left or when the puzzle can no longer be solved, and offers Undo, Retry or an extra tube right away.
Each correct sort in a row adds to your combo. Every five in a row raises the multiplier, up to x8. One mistake or missed marble resets it.
Yes. Levels, stars, hints, best scores and stats are saved automatically in your browser on this device.

Marble Sort is a free, deeply satisfying color-sorting puzzle with a conveyor-belt twist. Marbles roll down the belt one after another, and your job is to route every single one into the box that matches its color - three marbles per box, every box filled, level complete. It sounds trivial. Then level 15 adds a third color. Then a fourth. The belt speeds up, the boxes fill unevenly, and what began as a relaxing tap-along becomes a genuine test of reading ahead: the best players watch the incoming marbles, not the boxes, and plan two or three sorts before each marble arrives. With 120 levels of procedurally generated puzzles, the game scales beautifully from a calm color-matching toy for kids to a genuinely tricky sorting challenge for puzzle veterans - colors ramp from 2 up to 6, and belt speed climbs steadily with your progress. There are no timers breathing down your neck and no fail states, so the experience stays on the relaxing side of arcade even when the belt is flying: a wrong sort just means shuffling your plan, not losing the run. Satisfying sound effects punctuate every correct sort, progress and level unlocks are saved automatically on your device, and the whole game runs in any modern browser with no download, no installation and no account. It is the perfect coffee-break game - playable in 30-second slices or hour-long sessions - and a wonderful way for younger players to practice color matching and planning. Tap in, find the rhythm of the belt, and sort your way through all 120 levels of marble-moving satisfaction.