Chat Noir (The Black Cat), a turn-based puzzle game based on a very simple idea: darken the spots to confine the cat and keep it from escaping off the edges of the board. Each new game presents you with a random arrangement of pre-darkened spots, and the rest is up to you. While it could be argued (and perhaps even proven) that some initial arrangements are impossible to win.
This is not a very easy puzzle and I wish you luck and it will drive you nuts.
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