Hanayama has done it again, with the cast metal Nutcase Puzzle. The ''nuts and bolts'' appearance of the puzzle may trick you into believing it's simple to solve. But this brainteaser is a total brain drain. Designed by Oskar van Deventer, the puzzle presents two challenges. First, remove the small nuts by disassembling the nutcase. Then, reassemble it, but change the wording from ''nut case'' to ''case nut.'' We've included the solution along with your puzzle just in case you find yourself stumped. This amazing brainteaser puzzle is just one of the many intriguing puzzles from Hanayama. Rated Level 6, considered very difficult by most puzzlers.