The 4x4 Cube, also known as the Rubik's Revenge, is a three-dimensional combination puzzle. It consists of 16 smaller squares on each face, making a total of 96 smaller squares. The objective is to twist and turn the cube to return it to its original state, where each face displays a single color. Unlike the standard 3x3 Cube, the 4x4 Cube has no fixed center pieces, which adds complexity to the puzzle. It features additional layers and can create unique patterns and challenges. Solving the 4x4 Cube requires understanding various algorithms and strategies to navigate its increased number of combinations.