DOT Cast Metal Puzzle from Hanayama Puzzles of Japan is both a delightful and tricky brain teaser puzzle. It consists of two interlocking pieces. The object is to separate the black and chrome pieces. The second puzzle is to re-assemble the pieces flat back together. Measures approximately 2.25 inches in length when assembled. Recommended for ages 13 to 105 years. NO force is used to solve. Forcing pieces may damage the puzzle !! Bonus Red Velveteen Drawstring storage pouch. Measures approximately 3 x 4 inches laying flat. Rated by the manufacturer as a level 2 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. DOT is part of a series of 60 plus very interesting and mentally provocative metal brain teasers from the Hanayama Puzzle Company.