You may know this one already and you may know it by more than one name. The creators of the most popular version on line call it Chat Noir, or Black Cat in French. It is also known around the web as “Circle the Cat” or “Trap the Cat.”
This one is a game. Your objective is to trap the cat by circling it with dark spots on the grid. The cat starts in the middle and moves on place with each of your moves. The cats objective is to get off the grid. It isn’t a real hard premise, but can be a hard objective.