While you are moving on a flat platform with cannons, you will come across 2 passages. You should solve the best of these transitions in a short time and maneuver accordingly. While passing through the doors, the number of balls increases or decreases by the value on the doors. To reduce the number of balls, you must go through the red colored gate. Gates to increase the number of tanks are blue. You can have 45 balls in total. As you level up, you will have more enemies. Therefore, you should make the right decision and increase the number of balls.