With most of the inner workings completely hidden, Hanayama Cast Nutcase is almost like a physical logic puzzle, challenging not just your hands but your mind to gather clues and wok towards a solution. There are two goals to the Cast Nutcase created by the Dutch puzzle inventor, Oskar: Remove the small nut by disassembling the cast nutcase. This is your first step! Try to change the wording on the bolt from "nut-case" to "case-nut". It's not as easy as it looks. Can you solve this intricate interlocking-themed puzzle? At a 6/6 difficulty and often lauded as the most difficult Hanayama puzzle, Nutcase won't make it easy.