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Rainbow Sort Online

by crokocat · Puzzle

Rainbow Sort is a glossy marble color-sort puzzle: drop rolling marbles from the trays onto a moving conveyor and pack each one into the box of its own color, before the belt fills up and jams.

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.

How to play Rainbow Sort

One belt, a row of color boxes, and a steady rain of marbles — that is the whole game:

Desktop: Click a tray to drop, and click a box to send the marble there.
Mobile: Tap trays and boxes on the touch screen — the layout fills phones and tablets.

Game modes

ModeWhat changesWho it's for
ClassicFixed set of marbles per level; clear them all to advance.Best for players who like a puzzle with a clean finish.
EndlessMarbles keep coming and the belt speeds up; survive as long as you can.For chasing a high score and a long flow state.

Tips for Rainbow Sort

Who made Rainbow Sort?

Rainbow Sort was built by crokocat game studio in 2026 — a full-canvas take on the marble color-sort puzzle, with rolling-marble physics, a moving conveyor and color boxes, tuned for both mouse and touch.

Guides & tips

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About this game

Controls
Tap a tray to release its next marble onto the moving conveyor, then steer each marble into the box of the same color. Fill a box to clear it — and never let the conveyor overflow.
Supported devices
desktop, phone, tablet
Developer
crokocat
Genre
Puzzle
Release date
July 2026
Latest update
July 2026

Related categories

puzzlesortingmarble sortcolor sortlogiccasual

Frequently asked questions

Is Rainbow Sort free to play?

Yes. Rainbow Sort is free on crokocat with no download and no sign-up — it runs entirely in your browser on desktop, phone or tablet.

How do you play Rainbow Sort?

Drop marbles from the trays onto the moving conveyor and guide each one into the box of its matching color. Fill a box to clear it, and keep the conveyor from overflowing.

How is it different from ball sort or water sort?

It is the same color-sorting idea, but with rolling marbles and a moving conveyor instead of static tubes — so timing and belt space matter as much as which color goes where.

What happens if the conveyor fills up?

If the belt overflows with marbles that have no matching box open, the level ends. Clearing completed boxes quickly is how you keep space to work with.

How many levels are there?

Levels grow from a few gentle colors to fast, crowded boards with more colors and a quicker conveyor. Your progress is saved automatically between visits.