1. First enter the game and select the function of rocket launcher, as shown in the figure below:

2. After selection, click the Start Fighting function in the red box, as shown in the figure below:

3. After entering the game, find the fortress indicated by the arrow, as shown in the figure below:

4, activate the fortress will appear super mecha, as shown in the figure below:

5, finally can use the mecha combat, as shown in the figure below: