Rainbow Sort

Rainbow Sort belongs to the color-sort family that has quietly become the biggest thing in casual puzzles — the same itch as ball sort and water sort, but with real rolling marbles. Colored marbles pour from trays at the top, tumble down onto a moving conveyor with proper physics, and it is on you to send each one home to the box that matches its color. Something about mixed colors in motion makes your brain refuse to leave them unsorted.

The loop is simple to learn and hard to put down. Tap a tray to drop its next marble, watch it roll and bounce onto the belt, then guide it into the matching color box below. Each box holds a small set of one color; complete a set and the box clears with a satisfying pop, freeing room for the next rush of marbles.

The whole game lives in one number: space. The conveyor only holds so many marbles at once, and marbles you cannot place yet keep circling and taking up slots. Drop carelessly and the belt clogs with colors that have nowhere to go — let it overflow with no matching box open and the level ends. So Rainbow Sort is really about order and timing: which color to commit a box to, which marble to hold, and when to clear a set to open breathing room.

Levels ramp gently and then bite. Early boards use a handful of colors and a patient belt; later ones add more colors, a faster conveyor and tighter box counts, so you are planning two or three drops ahead just to keep the flow moving. Sessions stay short and snackable — one more level always fits — and your progress is remembered between visits.

It runs entirely in your browser with nothing to download and no account to make, and it is built full-canvas so the board fills the whole screen on desktop, phone or tablet. Pick it up for two minutes at a bus stop or lose an evening chasing a clean board.