The bombs will be dropped on the weapons silos, while the lasers can destroy enemy spacecraft sent to intercept the player.

While the player has only one spaceship per game, the spaceship is well-armored and can take multiple hits, but each hit will cause some form of temporary damage affecting the player's control of the ship, such as decreasing its maneuverability or causing sporadic faults in the weapons systems.

A hit will also cause the ship to lose altitude, making it extremely dangerous when flying low.

If the player's ship collides with the trench or an alien fighter, the game ends and Earth is destroyed.

Points are added to the timer for each destroyed alien fighter, giving the player additional time to complete the mission.