Hanayama Cast Puzzles are well-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.

I came up with the idea for this puzzle when I was 19 years old. It simply came to me during a walk home in the snow; it is truly a creation from my youth. Unfortunately, I can't say anything about the construction of the puzzle at this point, as I would otherwise reveal how to solve it. I don't want to disappoint the fans who expect frustratingly difficult puzzles from me.

Moreover, the fans who refuse to accept any hints are the ones who make me the happiest! The key word is 'needle.'.