Interlock, the hide the plug and socket puzzle!
The Goal: Select pieces from INTERLOCK'S complete mathematical set of 12 building blocks to build different shapes. Each 1x1x2 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 50 shapes to build arranged easy to hard.
CONTENTS:
12 Interlock Puzzle Pieces
Challenge Booklet with instructions and solutions