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Cast Delta Metal Puzzle from Hanayama of Japan is a delightful and tricky brain teaser puzzle. It consists of a three (identical-looking) triangular-shaped interlocking pieces. This is a really fascinating disentanglement brainteaser. You may find yourself totally immersed into how best disentangle the 3 pieces. Recommended for ages 12 to 105 years. A few bright 7 to 11 year olds may also enjoy, provided they are aware that forcing the puzzle could destroy it. Rated by the manufacturer as a level 3 difficulty (on a scale of 1 to 6; where 6 is the most challenging.)