Hanayama's Cast Marble is a delicate and neat little toy. It consists of two shiny pieces forming a frame around a little marble. The goal is to disassemble the toy by twisting the pieces and rotating the marble. Even though the puzzle can be solved accidentally simply by playing with it long enough, the original solution is neat and inventive. Both disassembling and putting the parts back together are challenging and can be frustrating on times. Overall, I like a lot the design and the locking mechanism of Cast Marble, but for some reason I do not enjoy it as much as other products in the series. Still, it is a good puzzle and gets my recommendation.