In the game UFO Defense you will be served in a tank brigade at one of the military bases. As you wake up, you will see how it hovered over a huge spacecraft, which began to produce smaller ones. They can be of different colors. Now you lead the fire from your tank, you will have to fire on them and destroy them. For this you will have two types of shells. To control them, you will see two buttons of different colors. If the enemy ships have a white color, you will have to press the button of the same color. If black on another. So you will shoot down these aircraft.