Rubik's cubes (Johan de Ruiter)Discuss about this problem
Find the hardest possible N*N*N Rubik's cubes.
Two parts contest: one part to submit your cubes to solve, and one part to solve the submitted cubes.
First part: submit several hard-to-solve cubes for every NxNxN per participant
Second part: solve all submitted cubes in the minimum number of rotations (half or quarter turns may give us 2 subparts)