Put your brain in gear and see if you can figure out how to separate the 3 interlocking pieces which make up the ENIGMA brain teaser puzzle. This is a tricky puzzle. This puzzle requires a lot of concentration and careful approaches. Rated as a LEVEL 6 difficulty by the manufacturer (Hanayama Puzzles of Japan) on a scale of 1 to 6 where 1 is easiest and 6 most challenging. Your experience could differ. Thought by many to be one of the most difficult in this series of over 60 different brain teasers. The interlock is an amazing creation. Solved with clever movements. NO FORCE ever needed. Patience and planning are the key to success. Small, compact, pocket-size cast metal brain teaser measures approximately 4.5 inches stretched out and .25 inches thick. Recommended for ages to 13 through 105 years. Bonus soft Red, velveteen drawstring storage pouch. Measures approximately 4 x 5 inches laying flat. Bundled Items.