The Rubik’s ‘Professor’s Cube’ is the 5x5 version of the famous Rubik’s Cube. The Rubik’s 5x5 is not for the feint hearted and is the most complex of all the Rubik’s Cubes. However, knowledge of how to solve the 3x3 Cube and the 4x4 Cube will help you a lot. The full number of permutations for the 5x5 Cube has been calculated at 283 duodecillion on the long scale or 283 trevigintillion on the short scale - (no - we had never heard of a these “illions” either!!)