Great puzzle that consists of a hollow cube with engravings a 7 mazes on the front. Inside the cube there are 7 layers representing a maze each. A metal ball (must be acquired separately) must traverse the mazes and go through the layers and come out from the other end.

The back of the cube can be opened and the ball can be reset to the original position.

Here is a YouTube review of the puzzles:
https://www.youtube.com/watch?v=ElTQaRSKFNw