Difficulty: 4 out of 6 (1 = very easy; 6 = very difficult)
Mobius Metal Puzzle - Cast Puzzle Hanayama
Delivered without solution.
Have you ever heard of the Möbius strip?
It is a complex surface where the front and back are indistinguishable. In this puzzle, obstacles have been placed on the surface and block the passage, like in a labyrinth.
As you go forward, the front becomes the back and vice versa, leaving you in awe. The theme of the puzzle is the ribbon.