Abstract: A three-dimensional tic-tac-toe game including a game board having a plurality of modules adapted to be interconnected to one another, a plurality of X-shaped game pieces, and a plurality of O-shaped pieces. Each of the X-shaped game pieces and O-shaped pieces includes protrusions at one end and recesses in an opposite end. Each of the modules includes recesses. The protrusions of each of the X-shaped and O-shaped pieces are adapted to engage the recesses of the modules, as well as the recesses of other X-shaped or O-shaped pieces. The X-shaped and O-shaped pieces may be stacked on top of one another for three-dimensional game play. Alternately, the modules and the X-shaped and O-shaped pieces include magnets to engage one another.