The Hanayama Cast Puzzle - Cake is a Level 4 brain - teaser. A quarter of the cake - shaped puzzle has been cut away, revealing three identical layers inside. It looks simple at first glance but is actually very ingenious, designed by American designer Bram Cohen. Hanayama is globally famous for its high - quality, challenging puzzles. This cast metal puzzle comes with 6 levels of difficulty and is Mensa - rated. Most puzzlers find Level 4 puzzles quite challenging. Can you disassemble the pieces and then reassemble them?

To use this Hanayama Cast Puzzle - Cake, start by looking closely at the cut - away part to understand the internal structure. Try to gently move the pieces to figure out how they fit together. When taking the pieces apart, do it slowly to avoid losing any small parts. If you get stuck, take a break and come back with a fresh perspective. As for maintenance, keep it in a dry place to prevent rusting. Avoid dropping it or applying excessive force, as it's made of metal and can get damaged. With a bit of patience and practice, you'll be able to master this challenging puzzle.