7 Pcs, all different, will form a cube 240 ways. In addition, there are many other shapes to make each using all the pcs. Our instruction sheets include 60 3-D shapes that can be made (with solutions), along with recommended websites that are dedicated to this puzzle that will give you many more shapes, plus math theory, history and more. Invented by Danish mathematician Piet Hein in 1936. Kids really enjoy it, but it is also a favorite with seniors as it develops new neural synapses in addition to being very entertaining. It will develop spatial relationship skills in all ages. You start to be able to visualize the relationship of the piece in your hand to the available space in the puzzle in your mind.