Stackable Game Piece

FIG. 1 is a front elevation view of the stackable game piece of my design. FIG. 2 is a right side elevation view of my design. FIG. 3 is a left side elevation view of my design. FIG. 4 is a bottom plan view of my design. FIG. 5 is a top plan view of my design. FIG. 6 is a back elevation view of my design. FIG. 7 is a front perspective view of my design; and, FIG. 8 is a front perspective, exploded view of my design. The broken lines in the drawings illustrate environmental subject matter only and form no part of the claimed design.