Pofu: Color Drop Puzzle

Touch one pofu. Every pofu of the same color that it is standing against goes with it, corners included. Then everything above the gap falls.

That falling is the game. The same board cleared in a different order is a different board, and a careless first touch can leave you with a color you can no longer reach. Three hundred levels, each one stored with a solution the test suite replays through the shipping rules, so every board you are given can be finished.

Fifteen pofu are more than a color. One takes its whole color wherever it is. One counts as every color and bridges two groups. One hands the touch back. One sweeps its row and its column. One cannot be taken by a group at all. One wears a shell that takes two touches. One is counting down, and at zero it armours up. Two take the level back from you: a trap that returns you to the start of this level, and one darker thing that returns you to level one.

Each board also carries one blast, which takes a color wherever it sits on the board and clears the hazards it touches. It is never required - every level can be finished by touch alone - and it is the one move a finger cannot make.

There is not a single word in the game. The rules live behind the i in the corner, drawn: a board before, an arrow, the same board after, generated by the same code that runs the game, so the diagram cannot drift from the rule.

Plays offline. No account, no sign-in, no purchases. Ads support it: one between levels every so often, and optional videos while a board is live - another blast, your last touch back, or one hazard off the board - never more than two on the same board, plus one to carry on after your touches run out. None of them is ever required to finish a level.