Abstract: A plurality of square-shaped playing pieces (B), which may comprise two-dimensional cards or a face or surface of three-dimensional cubes, are disposed within a square-shaped array (C) so as to define a playing game or puzzle (A).

Abstract: A game or puzzle may comprise a two-dimensional embodiment (10) defined by four square-shaped playing cards or puzzle pieces (12), or a three-dimensional embodiment (110) defined by four cubes (112). Indicia is located at each corner (16) of each playing card or piece (12), as well as at a central region (18) of each peripheral edge of the card or piece (12), while similar indicia is located at each corner (116) of each face of each cube (112), as well as at a central region (120) of each cube face. When the cards (12) or cubes (112) are disposed in their proper positions and orientations with respect to each other, predetermined requirements are satisfied between various sets of the indicia indicating that an end to the game, or a solution to the puzzle, has been reached. In order to serve as proofs of solutions, and thereby insure that a true solution has in fact been reached, other sets of indicia will likewise be required to satisfy predetermined relationship requirements.