The object is to get each of the 16 columns of numbers to add to 50 at the same time. Over 65,000 permutations with only 1 correct solution. We used maple and cherry for the woods. It creates a very beautiful look to the puzzle. Note this puzzle does not actually open or allow for space to hide something. The goal is to arrange the wheels such that all columns add to 50. There is a base ring and then 5 rings that rotate . To complicate matters, the top 4 sets of rings are all notched, so they will expose or hide some of the numbers on the ring below as the rings are turned. Makes for a lot of possible combinations! It essentially turns the 16 columns into 24 possible columns. It is quite a challenge. I recommend you watch the video link. It will come unsolved in the package, but includes a picture of the solved puzzle. There is only 1 possible solution. Design by David Janelle.