Take the third-order Rubik's Cube as an example. The first method of repair is called the cross.

1. First find the yellow center block, keep the yellow center block at the top, and start to find out where the four white edges are. If you find any white edges, they are already in the white position in the above picture. As shown in the first step below.

2. Return of bottom edge (also called the correct recovery process of bottom span and bottom quadrangle)

After completing the first step, keep the yellow center block on it, hold the Rubik's cube, see what color the right center block of the Rubik's cube is, and turn the yellow top layer to make the edges of the white side block and the right center block have the same color, as shown above. Then turn the right hand twice, and the white edge block will return to the final position correctly.

Continue to keep the yellow face up, and rotate the whole cube to the left once, that is, put the white square just finished in the front position. Then look at the color of the center block on the right and repeat the above steps. The last four white blocks will return to the correct position one by one. At this point, the second step of reducing the four white edges is completed.

3. Return to the bottom corner (restore the four corner blocks of the first layer of the Rubik's Cube)

The Rubik's Cube has eight corners. First, find the corner block with white color from the position of the corner block. Find a white corner block and read the other two colors of the corner block. For example, if you find a corner block with white, blue and red, you need to put the corner block between the blue center block and the red center block.

When the white of the corner block is up, observe whether the corner block is close to the left hand or the right hand. The left-hand formula is close to the left hand for three times and the right-hand formula is close to the right hand for three times. Do the left-handed formula three times as shown below.

The left-handed formula is as follows:

As shown in the figure below, do the formula on the right three times in a row.

The formula on the right is as shown in the figure:

Extended data:

The third-order Rubik's cube is usually a cube, made of elastic hard plastic. The conventional racing game is to disrupt the Rubik's cube and then restore it in the shortest time. By 2020, the official world record of the third-order Rubik's Cube was broken by Du Yusheng of China in Wuhu Competition 2065438+200865438+1October 24th, with a single time of 3.47 seconds.

The generalized Rubik's cube can refer to all kinds of geometric bodies that can be disturbed and restored by rotation. The Rubik's Cube, together with Huarong Road and Indie Diamond Chess, is called the three wonders of the intellectual game world by foreign intelligence experts, and its popularity can be called the miracle of the intellectual game world.

The third-order Rubik's Cube is a 3×3×3 cube structure, which consists of 27 color blocks. The third-order Rubik's Cube, through rotation, has a total change of * * * 4325200327489856000 ≈ 4.3 ×1019.