Gradient: color sort puzzle

The board has fallen apart into colored tiles, and their order is lost. Your task is to bring it back: swap the tiles until the color flows evenly, shade after shade, without a single break.

There is nothing to rush here. No timer, no mistake counter, no way to lose. Make three moves and close the game, or spend half an hour on one board — the level will wait.

Difficulty grows quietly. The first boards are 7 by 5 tiles, later ones 12 by 9 and 14 by 11, and by the end you face 16 by 12: a hundred and ninety two shades to put in place. Some tiles are pinned and marked with a cross — they hold the picture together and hint where the color is heading.

There are 1200 levels in all. Every one is built in advance and has a solution — none of them needs luck, only an eye for shade.

A solved level can be viewed in full, along with the path you took to it. Moves and time are recorded for you, not for a leaderboard. Progress is saved and carried between devices when you are signed in.