A revised universal base structure which is adapted for use in manufacturing various different versions of an electromechanical game using the same base structure. The base structure provides a network or grid of recessed areas above which a ground plate may extend. The recessed areas are formed as small squares and various small playing pieces are receivable in the recesses so that they can be retrieved by players during the course of game play. However, the base structure can be used with various uniquely different ground plates and unique upper boards to form various different embodiments of the differing games.