Hanayama Cast Puzzles are finely crafted metal puzzles that stand out not only for their exceptional quality but also for their extraordinary and high-quality design. The name 'Cast Puzzle' comes from the English word "to cast," which means to mold metal.

The challenge of this intricate metal puzzle is to separate the pieces and then reassemble them.

Four pieces of the same shape are loosely connected to form this puzzle. All the pieces fit together loosely, and it seems as though they can be easily taken apart. However, one soon finds themselves puzzled, as the puzzle offers no clues on how to solve it.

The trick is to avoid thinking too rigidly and to relax the mind while facing the challenge. This puzzle was designed by American Bram Cohen.