Abstract: The present invention concerns a tridimensional puzzle comprising elements movable by gravity within a volume limited by the walls of a box. It comprises, more specifically, on the one hand, n identical parallelepipedic elements and, on the other hand, a transparent parallelepipedic box the sides of which are multiples of the sides of one element and the volume of which is roughly equal to that of n+I elements, the volume of one element left vacant in the box allowing the displacement of at least some of the elements and the value of the multiples being such that at least two of the n elements do not come into contact with edge of the box.