OrthoCube  Interlocking puzzle by Stewart Coffin STC 1
Free     Printables     Printable Puzzle Project

Ortho-Cube - Interlocking puzzle by Stewart Coffin (STC #1)

Assemble the twelve pieces into a 5x5x5 cube with holes on its faces as shown in the cover photo ...

similar models —

Ortho-Cube - Interlocking puzzle by Stewart Coffin (STC #1) alternatives