Kasane

Layer. Blend. Matching colors disappear.

Place colored pieces onto the board. Red, blue and yellow blend into purple, green and orange; all three together make black, and white lightens whatever it touches. Layer the same color again and that component cancels out and vanishes. Match every cell of the target pattern to clear the puzzle.

Exactly one solution — always

Every puzzle is generated backwards from a finished board, and its uniqueness is verified by an exhaustive count. You will never stumble onto an accidental second answer.

1000 puzzles, graded by depth — not by color count

Four tiers — Easy (4x4, three colors), Normal, Hard and Oni — with the piece count stepping up inside each tier. Adding more colors does not make a puzzle harder; only how many pieces stack on a single color does. That structure is the difficulty curve.

Only the good boards made the cut

Far more puzzles were generated than shipped, then ranked by "small color clumps, many distinct colors" and taken from the top. The selection exists for one reason: so that neighboring cells blend into many different colors.

Built to sit well in the hand

Play with mouse or keyboard. Each of the twelve actions takes up to two key bindings, and the wheel swaps pieces. The board is drawn like layered sheets of colored washi paper.