Welcome to 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 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 50 shapes to build arranged easy to hard.
So what are you waiting for? Pick a block and start plugging!
12 Building Blocks
Challenge Booklet with instructions and solutions.
Note: Parts and Colors may vary from those illustrated.

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