One cat per patch
Every row, column, and colour gets exactly one cat. No guessing — the board has one solution.

Catdoku is a placement puzzle. One cat in every row, column, and colour. They cannot touch.
Start on a small patch. Work up to a late board. Come back for today's grid.
Play it here. The same engine as Dogdoku and Squirreldoku, with its own yard.
Every row, column, and colour gets exactly one cat. No guessing — the board has one solution.
Cats cannot touch, not even at the corners. Mark the squares you've ruled out and work square by square.
From a 4×4 first patch to a late 8×8. Three lives. A wrong cat costs one.
Progress stays on the device. No account, no timer, no energy.