Abstract: A puzzle consisting of several pieces to be assembled to form a structure of predetermined shape or aspect, each piece including at least one tongue or a cut-out into which is to be fitted a tongue of an adjacent piece. Each tongue or cut-out is chamfered with respect to the surface of the piece along a periphery of the tongue or cut-out, and wherein each tongue or cut-out is provided with a counter-chamfer extending along at least a portion of the chamfer of the tongue or cut-out.