The Instructions The task is to design a 3D Grid suitable for inclusion in the 2022 3D Calendar Puzzles publication. The RPM is in memory of Ray Parry-Morris, who designed many successful 3D grids. Anyone may enter. The Results There were 5 entries for this year’s competition. The submissions were initially marked and graded by… Read more Results of the 2020 RPM Trophy 3D Grid Design Competition