The Gordian Knot puzzle box requires at least 36 moves before a single compartment is revealed. These moves involve carefully sliding elements on the surfaces of the box, until eventually a "key" is revealed. (Sorry, I will not be more specific than that.) The box is composed of a myriad of different exotic wood panels that interact with each other in a myriad of different ways as they are slid. This is an extremely nice box with an extremely clever opening mechanism ... one of my favorites.