When a player claims the fourth point of the square, they color in the square. The player who colors in the most squares wins.
(Note: when we played this in class, one of the students asked if they could create any sized square and claim the area inside the square. After experimenting a little, we decided that you had to claim the smaller squares on the board.)
I have printed out half a class set of this board, put it in a plastic cover, and we use dry erase markers for reusable game boards.
To download a printable game board with directions for Claim, please click here.