The gameplay is in the style of Williams Electronics' "Defender", with some influences from "Scramble" and "". Players control the hero trying to rescue the scientists on a horizontally-scrolling game field. Players must elude or engage various aliens—some slow, others faster—and return the scientists to the base's eponymous dropzone. The aliens capture scientists walking along the ground. The player must shoot the enemy aliens and catch the falling scientists. Sometimes the aliens will carry lethal androids instead, which must be avoided.