I have various Cast Puzzles of difficulty levels 5 and 6 of this manufacturer and find it with the most difficult. It has been more fun if you do not notice every little step from the beginning and the "deconstruction" thus again can tackle a new challenge. I spent several hours trying to build this part apart and put back together. The approach is not evident, so much time is wasted to try out. But it feels great, and the fiddle is fun. It's harder than Vortex, Equa or Enigma. The fun factor is due to the high frustration risk is not very high, but who buys this part, eh delight is in the tinkering and not expect really "fun".
