Precision Puzzlemaking Primer -- Volume 1

Step 13 Wookey Hole

This puzzle requires four sets of each of these three pieces. That's 12 pieces total. The only way to get them together is by building each set into identical subassemblies which then twist together into pairs. These pairs slide into each other to form a 5x5x5 cube with a hole through the center of each face.

Yet another fantastic Stewart Coffin design. For more designs of his I highly recommend buying his new book "Geometric Puzzle Design" or alternately you can access much of the same information in his older book entitled "The Puzzling World of Polyhedral Dissections" which is freely available here:

http://johnrausch.com/PuzzlingWorld/default.htm