Huzzle Cast Nutcase by Hanayama

There are two goals to the Cast Nutcase created by the Dutch puzzle inventor, Oskar:

1. Remove the small nut by disassembling the cast nutcase.

2. Cast puzzle enthusiasts (nutcases) can enjoy trying to change the wording on the bolt from ‘nut-case’ to ‘case-nut’.

The key word is “Interlocking.”