4524161500315648 Felix Puzzle 智趣坊 Cast U & U 錯 Two U-shaped bolts and four nuts - this looks like a combination of spare parts but looks are deceiving. This puzzle comes with a deviously hidden trick. The ke Product #: felixpuzzle-Cast U & U 錯 2023-01-23 Regular price: $HKD$100.0 Available from: Felix Puzzle 智趣坊In stock