Parted Square Puzzle
The Puzzle:
Each has a different pattern of holes.
Which three of them can form an opaque (non-transparent) square when stacked on top of each other?
You are allowed to rotate or flip the squares.
Author: Peter Grabarchuk
This Puzzle © 2007 Peter Grabarchuk. All Rights Reserved.
More from Peter Grabarchuk at PeterPuzzle.com
Do you have the answer? Check against our solution!