Oh no! Your cats have hidden in the boxes you're trying to unpack. Work through the boxes, but be sure not to disturb your sleeping kitties...
Click a square once to mark it as a cat-owned box. Click a second time to clear the square.
Cleared squares will display how many cats they are immediately next to horizontally, vertically, or diagonally.
The game ends when you disturb a cat, or when you have cleared all non-cat boxes!