HASHTAG (AKA SHIFT) Cast Metal Puzzle from Hanayama Puzzles of Japan is both a delightful and tricky brain teaser puzzle. It consists of a "3D Hashtag-Shaped" cast metal body body with four interlocking pieces. The object is to separate the four pieces. The second puzzle is to re-assemble the four flat pieces back together. Measures approximately 1.4 inches in three dimensions when assembled. This is a really fascinating disentanglement brainteaser. HASHTAG Hanayama Puzzle is a NEW 2017 Release. Also known as "SHIFT" Hanayama. Recommended for ages 13 to 105 years. NO force is used to solve. Forcing pieces may damage the puzzle !! Includes Red Velveteen Drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. 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. HASHTAG is part of a series of 60 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.Reminder. NO FORCE is ever required to solve the puzzle. Just a series of clever moves.