The puzzle is solved when a cat 🐱 is placed next to each rat 🐭 (above, below, left or right), and no cats are touching, not even diagonally.
The numbers on the edge of the board indicate how many cats are in the corresponding column or row.
Tap a tile once for an ✕, twice for a cat, and three times to clear the tile.
Tap a number button on the edge of the board to add an ✕ to each empty tile in that row or column.