The Glass Puzzle Box The Glass Box by Benno de Grote is a box shaped marble maze with sliding keys at the corners to open and close various gates. The box will only open when the maze is solved, and features a clever trick to keep the marble in the start position until a solve is attempted. Very difficult.

Doog’s Greatest Hits V1 This is #57 out of 57 copies of Doug Menzies’ DGH V1 boxes, a complex, multi-step sequential discovery puzzle box designed to feature novel concepts. According to the designer, the box is a compilation of mechanisms from his other boxes which also turned out to interact in interesting ways. An amusing prize awaits within.