From the Manufacturer
This "cousin" of Gordian's Knot is elegant but cunning. Untangling Z-Knot is not as easy as it looks. Slide each piece in the correct sequence of 37 moves to take Z-Knot apart. With every move you make, one or more pieces will move easily — but there's only one right answer. It's up to you to determine which move is the right one. Included solution guide shows complete solution as well as full instructions for putting Z-Knot back to its original form. Ages 8 to Adult.
6920 Features: -Step by step solution book.-Ages: 8 to adult.-Players: 1.-General conformity certified. Color/Finish: -6 Colorful interlocking pieces. Assembly Instructions: -Easy-to-follow reassembly instructions.-Assembly required.