In the blood clan mobile game, you can brush two stars in the "Gate of the Alien World" in the game. The specific brushing method is as follows:

1. Open the game and enter the interface of "Gate of Alien Plane".

2. In the "Alien Gate" interface, select "Alien Gate Adventure" in the left menu bar.

3. After entering the "Plane Adventure", find the "Plane 2-2" level on the map.

4. After entering "Plane 2-2", defeat all enemies and have a certain probability to drop two-star Aiyou fragments.