Chinese literal translation is called "Pocket Rubik's Cube". It has two squares on each side. One official version of the Rubik's Cube has a side length of 40 mm, and the other axial second-order Rubik's Cube developed by Dong Xian has a side length of 50 mm ... The total variation number of the second-order Rubik's Cube is 3,674, 160 or about 3.67× 106. Pocket cube, also known as pocket cube, mini cube, small cube and ice cube, has a cube structure of 2×2×2. There are only eight corner blocks in itself, and there are no squares with other structures. The structure is similar to the third-order Rubik's cube, which can be restored by the formula of restoring the third-order Rubik's cube.
3X3 Cube
Because the Rubik's Cube is a mechanical educational toy invented by Hungarian architecture professor and sculptor Elnor rubik in 1974, its English name is Rubik's Cube ... I won't say much about other introductions. ..
Revenge of 4X4 Rubik's Cube
Compared with the third order, it is much more complicated, and its composition is divided into two categories. One is that the center is a sphere, and each peripheral small block is connected with the slide rail of the center ball, and will slide on the slide rail along the stress direction 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 peripheral block, 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. The English official name of the fourth Rubik's cube is Rubik's Revenge, which literally translates as "Revenge of the Rubik's Cube". The side length of the official version is about 67 mm, and the Mefferts version is 60 mm. The fourth-order Rubik's cube is considered to be the most difficult to restore among the second-order and fifth-order Rubiks' cubes. Although there are more varieties of the fifth-order Rubik's cube than the fourth-order, the central block of the fourth-order Rubik's cube is not fixed and cannot be restored by ordinary methods. That is 7401196841564901869874093949857433600000.
5X5 Professor Rubik's Cube
Literal translation is an "expert's Rubik's Cube", which also shows its difficulty. The best Rubik's Cube lovers can restore the fifth-order Rubik's Cube in about 1.5 minutes. The fifth-order Rubik's Cube has 8 corner blocks, 72 side blocks (two types) and 54 center blocks (48 movable and 6 fixed).
The central block of the fifth-order Rubik's Cube is 3×3 structure, so four central blocks of each color are equivalent, that is, the change state of the central block is (24! (4! 6))2 kinds. The positions of its 24 outer blocks cannot be moved at will, so there are always 24! A constantly changing state. 12 The 1 1 of the central side block can be interchanged, so the total * * * is 12! /2×2 1 1 Change the state. The total number of states of the fifth-order Rubik's Cube is 2828709422774 1, 8565318033310715032829365438+.
This seems terrible. ..
But it was fun. ..