Nutcase: Oskar van Deventer

http://www.eureka-puzzle.eu/eureka/index.php?/Cast-Puzzles/Game-Rank-6/Cast-Nutcase.html

Another gem from the smartest man in the world: Oskar van Deventer. Extremely difficult.

Look for the version made by George Miller with his 3-D printer: http://www.puzzlepalace.com/