Have you ever heard of the Mobius strip? It is a complex surface where the front and back are indistinguishable. In this puzzle, obstacles are placed on the surface and block the way, just like a maze. As you move forward, the front becomes the back and vice versa, leaving you perplexed. The theme of the puzzle is the strip. Created by Oskar Deventer from the Netherlands.

Hanayama is known worldwide for challenging puzzles and quality manufacturing. Can you take the pieces apart, then put them back together again? Hanayama cast metal brain teasers have 6 levels of difficulty, and each puzzle is Mensa-rated. Level 4 puzzles are considered challenging by most puzzlers.