Abstract: A planar surface game board is divided into orthogonal quadrants and subdivided diagonally. The quadrants are hinged together along contiguous edges at a first surface and the diagonal subdivision is hinged together at a second surface, permitting the board to be folded or collapsed inwardly of the first surface wherein diagonally divided segments collapse adjacent each other between square quadrant segments to form a folded board one-fourth its original surface size and four times its thickness. The hinges may be formed by scoring the respective surfaces without completely severing the board, leaving thin webs of material as hinges.