The four-step restoration method of the third-order Rubik's Cube is as follows:
First, our fourth step is to restore the top two layers first. The next step is to build the bottom fish shape. After the construction is completed, we restore the bottom side. After that, we restore the middle block of the bottom layer. Finally, we restore the Rubik's Cube.
Summary: Our fourth step is to restore the top two layers first; then build the bottom fish shape; after the construction is completed, restore the bottom side; restore the middle block of the bottom layer; finally, We have finished restoring the Rubik's Cube.
The Rubik's Cube, also known as the Rubik's Cube, is a mechanical educational toy first invented in 1974 by Professor Erno Rubik at the Budapest School of Architecture in Hungary. The Rubik's Cube has a variety of gameplay methods such as racing, blind twisting, and single twisting. Its popularity has not declined for a long time. Competitions of various sizes are held every year. It is one of the most popular intellectual games.
The Rubik's Cube in the usual sense refers to the third-order Rubik's Cube in the narrow sense. The third-order Rubik's Cube shape is usually a cube and is made of elastic hard plastic. The conventional racing method is to disrupt the Rubik's Cube and then restore it in the shortest time. Rubik's cube in a broad sense refers to various geometric entities that can be disrupted and restored through rotation. The Rubik's Cube, Hua Rongdao and France's Single Noble (Independent Diamond Chess) are known as the three incredible things in the intellectual game world.
Early attempts
In March 1970, Larry Nichols invented the "Puzzle with Pieces Rotatable in Groups" and applied for a Canadian patent. It was a 2×2×2 Rubik's Cube, but Each block is held together by magnets. Obtained (English) U.S. patent in 1972, two years earlier than Professor Rubik's third-order Rubik's Cube.