1. Restore the central block: divide the nine central blocks into three groups, each with three blocks, then align the three groups respectively, and then combine the three groups. Because the color block in the center of the fifth-order Rubik's cube is fixed, it is the center group first, and then the two sides group.
Take the center block on the opposite bottom surface as an example, and restore a yellow sidewalk center block in the center group to the bottom surface. Restores the first yellow kerb center block group to the bottom surface. Restore the second yellow kerb center block group to the bottom surface.
2. Merging edges: Merging the twelve groups of edges of the fifth-order Rubik's Cube. Before merging edges, the side edge block and the center edge block need to be placed in a specific relative position, and then merged.
Merge the center block and the edge block, and the center block is destroyed. Let the merged edges lean to one side, replace their first position with a group of messy edges, and then restore the previously damaged center block.
3. Restore according to the third-order Rubik's Cube: After "restoring the central block" and "merging the edges", the fifth-order Rubik's Cube has been successfully restored to the third-order Rubik's Cube. Because the relative position of the center block of the fifth-order Rubik's cube is fixed, the third-order Rubik's cube after the reduction is a "standard situation" and will not encounter the "special case correction" of the fourth-order Rubik's cube.
Precautions:
The process of restoring the six sides of the fourth-order Rubik's cube can refer to the formula and the method of restoring the third-order Rubik's cube are all possible. Don't use too much force during the operation to avoid damaging the Rubik's cube.
Bottom cross: (white is the bottom surface, and the color of the center block is the color of this surface). State: Turn the white square to be restored to the top layer, to the surface where it should be, and put it in the upper right position by turning the Rubik's Cube as a whole, that is, the final state is that the square to be restored is in the upper right position, the position that this square needs to be returned is in the lower right position, and the other three white squares are in turn.
On the way, you may meet an edge block in the middle layer at the junction of two restored edges, so you can turn one of these two edges to the top layer, then turn the top layer around to avoid it, and then turn the side that was turned around before, so that the restored edge block will not be destroyed.