A lone moon patrolman must defend the Earth from a horde of alien invaders. In this classic action-packed adventure, players control the moon patrolman as he navigates through 15 levels, each with its own unique challenges and obstacles.
The gameplay involves guiding the moon patrolman across the bottom of the screen while avoiding enemy spacecraft that are falling towards him from above. Players must time their movements perfectly to avoid being hit by the enemies, and pick up power-ups along the way to increase their chances of survival.