Each player starts with identical pools of pieces ranging in size from one square up to 5 squares joined together. They take turns placing pieces on the board, but must play so the new pieces touches previously played pieces of the same color diagonally only. I.e. a new red piece must be played diagonally touching an old red piece. It cannot share an edge with other red pieces, but may share an edge with pieces of other colors. The last player to be able to place a piece wins.