21 Cube Dissection Puzzles

Here are 21 different puzzles based on the dissection of a 64 unit cube into 4 parts. Six pairs of pieces are given. To make a puzzle choose any two pairs; the 4 puzzle pieces are to be assembled into a cube. The choices include using the same pair twice for a total of 21 possible puzzles. The puzzles are of four types: four where all 4 pieces are identical, eight where the pieces are of two types, eight where the pieces are of three types, and one where all four pieces are different. To ge