4x4x4 Rubik's Revenge

The 4x4x4 Rubik's Cube, also known as the Rubik's Revenge, is the 4x4x4 version of the original Rubik's Cube. It was invented by Péter Sebestény and released in 1981; it was going to be named the Sebestény Cube after its creator but was later renamed to attract fans of the Rubik's Cube.

This puzzle comprises 56 miniature cubes, or cubies, on the surface, with 24 centers showing one color each, 24 edges showing two colors each, and 8 corners showing three colors each. There are approximately 7.4 septilliard ($${7.4*10^{45}}$$) possible permutations.