The formulas of the fourth-order Rubik's cube are RUR'FR'F'R and Uw'( R U R'F R'F'R)Uw. Rubik's cube is a very common educational toy in life, but the Rubik's cube you usually see is only a third-order cube, that is, a cube with nine cubes on each side, and the fourth-order cube is an upgraded version. The upgraded fourth-order Rubik's Cube is still a cube with a structure of 4×4×4, and each side has 16 cubes, with a total of 8 cubes.

The fourth-order Rubik's cube is considered to be the most difficult to recover among the second-order and fifth-order Rubik's cubes. Although there are more varieties of the fifth-order Rubik's cube than the fourth-order, the central square of the fourth-order Rubik's cube is not fixed.

Extended data:

The fourth-order Rubik's cube has 8 corner blocks, 24 side blocks and 24 center blocks, which are divided into two categories:

The first center is a sphere, and each peripheral small block is connected with the slide rail of the center ball, and will slide in the direction of force when moving.

The second is the fourth-order Rubik's cube with the axis as the core. The composition of this Rubik's Cube is very complicated. Besides the central ball and the surrounding squares, there are many accessories.

As a racing sport, the fourth-order Rubik's cube with the second structure moves fast and is not easy to get stuck in high-speed rotation.

Baidu encyclopedia-fourth-order Rubik's cube