CAKE Cast Metal Puzzle from Hanayama Puzzles of Japan is both a delightful and tricky brain teaser puzzle. It consists of a small round ("Cake-Shaped") cylinder with three internal disks which have interlocking channels. The object is to remove the 3 internal discs. The second puzzle is to replace/ re-assemble back together. Measures approximately 1.6 inches diameter and .75 inches thick.. This is a really fascinating disentanglement brainteaser. You may find yourself turning the center disks around and around for longer than you planned. CAKE Hanayama Puzzle is a NEW 2017 Design. Recommended for ages 13 to 105 years. NO force is used to solve. Forcing pieces may damage the puzzle !! Rated by the manufacturer as a level 4 difficulty (on a scale of 1 to 6 where 6 is the most challenging.) Difficulty level shown on the packaging. Your own experience could vary substantially. CAKE is part of a series of 55 plus very interesting and mentally provocative metal brain teasers from the Hanayama Puzzle Company. Some serious puzzlers refer to these as "disentanglement-style puzzles" as they involve taking something apart and then re-assembling. Re-assembly can also be a puzzle and may be equally as tricky. Bonus soft red velveteen drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. Bundled Items. Reminder. NO FORCE is ever required to solve the puzzle. Just a series of clever moves. Recommended for ages 13 to adult.