DELTA Cast Metal Puzzle from Hanayama Puzzles of Japan is a delightful and tricky brain teaser puzzle. It consists of a three (identical-looking) triangular-shaped interlocking pieces.
Newly release in Spring, 2014. DELTA measures approximately 2.25 inches BY 1/2 inch thick.
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.) Level is posted on the bottom left of the packaging. Your own experience could vary substantially. DELTA is part of a series of 40 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.