A Hanayama Cast Hourglass metal puzzle — four interlocking cast pieces (2 sets of 2) that must be separated and reassembled. Comes with the original box. Rob loves puzzles and has both taken it apart and solved it, but it spent years in an unsolved state on the shelf until the pressure of an upcoming move finally motivated a proper sit-down.

Why a new owner would be happy

• Genuinely challenging: Hanayama rates this one difficult.
• Compact and satisfying — only 4 pieces, so nothing small to lose.
• Comes solved, so you can experience the ‘how does this even work?’ moment fresh.