Comes in two sizes. Great puzzle for desk or coffee table! Appeals to those who aren't usually puzzle people as you always seem to get close and it motivates you to continue. The object is to lay the 6 panels in the box such that they mesh together 2 layers high. Yuu will almost always quickly find a way to fit 5 of the 6 panels, but that last one just doesn't seem to fit - until you finally find the solution!