This is a brand new puzzle from Dutch puzzle maker Oskar van Deventer. The Nutcase has two meanings in this puzzle. 1. The case surrounding the nut. 2. The way you feel when you try to solve the puzzle.
This is in a limited edition box. The box is written in Japanese and some english. The description and other items in the box are written in Japanese. This is the most difficult Hanayama Cast Metal Puzzle to date with difficulty level rating of 6.