Designed Stewart Coffin, made byInterlocking Puzzles 2000.
(7 pieces, bloodwood and aluminum, 3 inches)
There are a total of 7 pieces;
2 pieces formed from 5 unit cubes with holes and rods,
4 pieces formed from 4 unit cubes with holes and rods,
and one 3 unit long rod.
They must be assembled into a 3x3x3 cube (there is a unit void in the center).
Stewart Coffin proposed this class of puzzles and suggested this particular selection of pieces
as one that has a "satisfactory" set of two solutions.
Below are two stages of a solution for which the last piece placed before the rod is the
and two stages of a solution for which the last piece placed before the rod is the