ROLAND WADDILOVE hands over command of the missile battery to you - and it's now your job to save the cities from alien attack
IN this action-packed arcade classic you are commander of one of Earth's many missile batteries. Your duty is to protect the surrounding cities from attack by hostile aliens who send their missiles streaking toward you.
At your disposal are powerful thermonuclear warheads which can be fired at the aliens' missiles. By carefully positioning your sights the warhead can be directed so as to explode just in front of a missile. This is sufficient to destroy it.
If you survive the first wave another swiftly follows - there's hardly time to catch your breath. There are 10 incoming missiles on each screen, and with each screen they get faster and faster.
The program has a high score table capable of holding the top five scores. There are nine levels of difficulty and any one can be selected at the start, the lowest being the easiest. Music accompanies both the high score table and title screen.
The program is structured and fairly easy to follow. Each subroutine has a title describing its function to help debugging.