Hanayama's Cast Marble is a delicate and neat little toy. The term "puzzle" seems not very appropriate for it however, since there isn't any particular smart idea or clever manipulation required for solving it. Due to the limited ways of manipulating the parts, it is not hard to figure out the technique needed to disassemble the toy. After that, it just takes a little bit of work, which resembles more cracking a safe than solving a 3D puzzle. Putting back the parts together is more challenging, but also fairly frustrating process. Overall, despite its shiny and elegant design, I am not very enthusiastic about Cast Marble and can not recommend you to buy it.