Convolution blockhead - design by Stewart Coffin 4x4x4 cube

What an interesting and difficult puzzle designed by Stewart Coffin. 7 complex pieces will assemble sequentially to form a 4x4x4 cube. I like this one alot. Really tests the spatial relationship skills. You will likely feel like a blockhead after working hours to solve this one. Measures about 2 3/4" cube.Excellent fits on this puzzle make it challenging to even dis-assemble, but of course the real challenge is in the assembly.

Convolution Blockhead A Stewart Coffin Wood Puzzle Brainteaser

Wooden Cube Puzzle - Hong Kong

What an interesting and difficult puzzle designed by Stewart Coffin. 7 complex pieces will assemble sequentially to form a 4x4x4 cube. I like this one

Convolution Blockhead A Stewart Coffin Wood Puzzle Brainteaser

Rhombic Blocks – Stewart Coffin Design #122 Brain

Convolution - Interlocking puzzle by Stewart Coffin (STC #30) by

Blockhead, European Wood Puzzles

PuzzleMad: 2012

Convolution - Interlocking puzzle by Stewart Coffin (STC #30) by

25% off on Blockhead for the weekend. It's quite the challenging

Convolution Neil's Puzzle Building Blog

PuzzleMad: 2012