Seven-step reduction formula of nine-grid Rubik's cube

The formula of the seven-step reduction method of the Nine-grid Rubik's Cube is: upper cross, middle edge block, lower cross, lower edge block, top corner block, middle corner block and top edge block.

1. Upper cross

First, we need to restore the upper cross of the Rubik's cube. The goal of this step is to cross the quadrangle of the upper layer according to the color. By rotating the upper layer of the Rubik's cube, we can correctly place the side blocks and adjust their positions, and finally form a cross.

2. Middle edge block

Next, we will restore the middle edge of the Rubik's cube. The goal of this step is to correctly place the four edges of the middle layer according to the color combination. By rotating the middle layer of the Rubik's cube, we can correctly place the edges and adjust their positions, so that the color blocks in the middle layer can be correctly combined.

3. Lower cross

The third step is to restore the next cross of the Rubik's cube. The goal of this step is to form a cross with four side blocks at the lower level according to the color. By rotating the lower layer of the Rubik's cube, you can correctly place the side blocks and adjust their positions, and finally form a cross.

4. Lower edge block

Next, we will restore the lower edge of the Rubik's cube. The goal of this step is to correctly place the four edges of the lower layer according to the color combination. By rotating the lower layer of the Rubik's cube, we can correctly place the edges and adjust their positions, so that the color blocks in the lower layer can be correctly combined.

5. Top corner block

Step 5, restore the top corner of the Rubik's cube. The goal of this step is to correctly place the top four corner blocks according to the color combination. By rotating the top layer of the Rubik's cube, we can correctly place the corner blocks and adjust their positions, so that the color blocks at the top layer can be correctly combined.

6. Intermediate corner block

Next, we will restore the middle corner of the Rubik's cube. The goal of this step is to correctly place four corner blocks in the middle layer according to the color combination. By rotating the middle layer of the Rubik's cube, we can correctly place the corner blocks and adjust their positions, so that the color blocks in the middle layer can be correctly combined.

7. Top edge block

The last step is to restore the top edge of the Rubik's cube. The goal of this step is to correctly place the top four sides according to the color combination. By rotating the top layer of the Rubik's cube, we can correctly place the edges and adjust their positions, so that the color blocks at the top layer can be correctly combined.

The formula of the seven-step reduction method of the Nine-grid Rubik's Cube is the upper cross, the middle side block, the lower cross, the lower side block, the top corner block, the middle corner block and the top side block. According to the steps of this formula, we can gradually restore all levels of the Rubik's cube and finally complete the whole restoration process.