COIL cast metal brainteaser from Hanayama Puzzles of Japan is a delightful and very tricky brain teasers. COIL consists of two odd-shaped metal pieces which resemble a rectangular shape with a hole through the center when together. The two pieces must be totally separated and then reassembled to solve the puzzle. COIL is small, pocket-size brain teaser. Assembled the puzzle measures 1.25 x 1.25 x 1 inch Rated by manufacturer as a level 3 difficulty on a scale of 1 to 6 (where 1 is least challenging and 6 most challenging). Rating are subjective. Your experience may differ. Comes apart and reassembles with positioning and clever movements. NO FORCE every required. Recommended for ages 12 to 105 years. A few very bright 7 to 11 year olds may enjoy provided they know NOT to ever force puzzle pieces. Makes a great coffee table or desk conversation piece. COIL is one 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.
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