Box is probably my favorite maze type puzzle from Hanayama. It consists of a punctured ring attached to a box frame and the task is to separate the two from each other. The puncture on the ring and several little grooves on the surface of the box let you pass the ring through the edges and eventually pull it out. Even though it is relatively easy, Box still can be tricky if you don't analyze well all available movements in the puzzle. What I like a lot about it is the neat design and the easiness with which the ring slides through the various edges. Overall a very nice and highly recommended puzzle.