Pinnex

Select pieces from Pinnex's complete mathematical set of 12 building blocks to build different shapes. Each 1 x 1 x 2 block has one plug and one socket in a unique location. You build shapes by fitting each plug into a socket of the next piece. When the puzzle is solved, each plug will fill a socket, and the completed shape will have no plugs or sockets visible. The Challenges: There are 14 shapes to build arranged easy to hard. Inventor: Sjaak Griffioen