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."
-Hanayama Co., Ltd. - 2007-
Age : 10+
Package : original packaging
Level : 6
Size : 2 in x 1 1/3 in x 1 1/3 in / 5 cm x 3.4 cm x 3.4 cm