Introduction Emerge from the safety of the bunkers to fire at the alien craft overhead and the occasional orbiting mothership. But watch out for the bombs which explode in mid-air and spray the area with shrapnel. On successfully completing each phase, the next phalanx of Invaders commences lower down the screen. A high score table records the top eight scores. Game Controls Z - Left, X - Right, SHIFT - Fire S/Q - Sound On/Off, P/R - Pause/Resume, ESCAPE - Ends the game Press 1 or 2 to select a one or two player game.