Bepuzzled |Cylinder Hanayama Metal Brainteaser Puzzle Mensa Rated Level 4, For Ages 12 And UpHanayama's Cylinder brainteaser gives you no clues to the solution and that's part of the fun. The outside of this elegant little knurled cylinder doesn't offer any hints, but we'll give you one: Think about it as though you are cracking a safe. After you separate the cast metal cylinder into its components, can you put it back together again? This cast metal puzzle designed by Vesa Timonen is considered difficulty level 4 (challenging). Measures 4.