Hanayama - Cast Quartet Level 6

QUARTET Cast Metal Puzzle from Hanayama Puzzles of Japan is a delightful and tricky brain teaser puzzle. It consists of two interlocked square-shaped polished metal puzzle pieces that come apart into four pieces. The object is to separate the interlock into four square shaped pieces. This is a very tricky puzzle and one of the most challenging in the Hanayama puzzle collection.