Chain is a level 6 cast metal brain teaser puzzle. The puzzle is unique in that it can be re-assembled in 3 different ways. Pieces are distinguished by either one, two or three dots on the end. Reassemble so that dot number one is in the middle, then so that the piece with two dots is in the middle, and finally the piece with three dots is in the middle. A great challenge for anyone who enjoys mechanical style take-apart challenges.