1, second-order Rubik's Cube

The English name of the second-order Rubik's Cube is Pocket Rubik's Cube or Mini Cube, which is directly translated as "Pocket Rubik's Cube". It has two squares on each side, 40 millimeters for one of the official versions, and 50 millimeters for the axial second-order cube developed by Dong Hyun. The total number of variations in a second-order Rubik's Cube is 3,674,160, or about 3.67×10^6.

2. Third-order Rubik's Cube

Third-order Rubik's Cubes are officially called Rubik's Cubes, after Professor Rubik, and they are the most common type of Rubik's Cubes in use today. The cube consists of a central axis with six center blocks attached, as well as eight corner blocks and twelve prongs, which when joined together form a single unit and can be rotated horizontally on either side without affecting the rest of the cube.

3, fourth-order Rubik's Cube

The English name of the fourth-order Rubik's Cube is Rubik's Revenge, which translates to "Revenge of the Rubik's Cube". Compared to the third order is much more complex, its composition is divided into two categories, one is a sphere in the center, each peripheral small pieces connected to the center of the ball slide, in the movement of the direction of the force will be sliding on the slide.

The second type is a fourth-order cube with a shaft at the center, in fact, this type of fourth-order cube is a fifth-order cube that hides the middle layer, and the small parts inside are the fifth-order side-centered and center-pronged blocks, with a protruding device on the center shaft that prevents it from locking up.

4. Mirror Cube

It is called "Rubik Cube Mirror", and it is a derivation and deformation of the third-order Rubik's Cube. It is characterized by its asymmetrical appearance and mirror coating, and can change its shape after being disrupted. It is also characterized by the fact that each prism and corner block is different in size. If you study it carefully, you can basically restore it if you know how to play a normal third-order Rubik's Cube.

5, the magic table

The magic table Rubik's Cube name is Clock, round structure, is now out of print, online can buy either foreign second-hand goods or domestic cottage products. The Magic Watch is a two-sided need to restore the "Rubik's Cube", each side of the top of the nine clock dials.

The magic watch has four gears to control the rotation of the hands. Each side has four buttons that move in and out on both sides. The state of the buttons affects the rotation of the corresponding gears.

Baidu Encyclopedia - Magic Cube