PADLOCK Cast Metal Puzzle from Hanayama Puzzles of Japan is both a delightful and tricky brain teaser puzzle. It consists of FOUR PIECES and looks like a regular padlock. The object is to separate all pieces. The second puzzle is to replace/ re-assemble back together. Measures approximately 1.6 inches tall and .75 inches thick. This is a really fascinating disentanglement brainteaser. <P> Recommended for ages 12 to 105 years. A few bright children between 8 to 11 years may also enjoy, provided they understand that NO force is used to solve. Forcing pieces may damage the puzzle !! </P> <P>Bonus Red Velveteen Drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. </P> <P> Rated by the manufacturer as a level 5 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. PADLOCK is part of a series of 60 plus very interesting and mentally provocative metal brain teasers from the Hanayama Puzzle Company of Japan. 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. </P> <P>NO this puzzle cannot be used as a normal padlock. Bad idea.</P> <P>Reminder. NO FORCE is ever required to solve the puzzle. Just a series of clever moves. </P>