Another great design by Stewart Coffin is the Four Piece Pyramid. Consisting of four pieces each made from 5 Edge beveled cubes, this puzzle is a real challenge. The pieces just do not look like they can go together to make a three sided pyramid. To add to the difficulty is the fact that it is serial interlocking.
Approximate Size: 2.5" x 2.5" x 2.5"
Designer: Stewart Coffin