IX Burr Puzzle
Burr puzzles have been confounding avid puzzlers for centuries, and there are many iterations that all relate back to the basic idea of an interlocking puzzle. The IX Burr Puzzle, as you might have inferred from the name, is made up of 9 nonidentical wooden pieces that interlock to form a 3D shape. There is a special piece cleverly hidden in the design that serves as a “key” to unlocking the sculpture. That’s the first challenge, separating the pieces. The real challenge is to build the shape again, which proves difficult because of the unique intricacies in each piece.