The Nickel Box was inspired to Donald by Stéphane Chomine's Château d'If. Donald raised the total number of moves to 70, but couldn't find a symmetric color pattern that would force this solution. It was Stéphane Chomine who found it.
The small number of assemblies makes it possible to solve the puzzle from the disassembled configuration to the assembled one, trying to fit the pieces into the box. This is both extremely difficult and very interesting, given the many combinations and dead ends that the move sequence features.