I am really divided with my opinion about Hanayama's Cast Square. The puzzle looks solid, beautiful, very interesting the first time you take it in your hands. Also, its construction itself is an engineering achievement, which is probably its most impressive feature. However, it takes just few minutes to play with it until the puzzle gets solved purely by accident. This happens almost every time, since the movements needed to reassemble it are very natural. Eventually it all comes down to what you expect from this toy. If you want a good mindbending puzzle, you should definitely pass this one. However, if you want to have a pretty toy with intricate design and mind-bogging mechanism inside - go on and get it!