The Void Cube is slightly more difficult than a regular Rubik's Cube due to parity. The lack of center cubes alters the parity considerations. A 90˚ rotation of a face either on the regular Rubik's Cube or on the Void Cube swaps the positions of eight cubes in two, odd parity, four cycles. Overall, a face turn is an even permutation. On the regular cube a 90˚ rotation of the whole cube about a principal axis swaps the positions of 24 cubes in six, odd parity, four cycles. On the regular cube a whole cube rotation is an even permutation. On the other hand, lacking center cubes, a 90˚ whole cube rotation on the Void Cube swaps 20 cubes in five, odd parity, four cycles. Thus, a whole cube rotation on the Void Cube is an odd permutation. In consequence, on the Void Cube turning the faces of th