Xenophobe

Xenophobe is a 1987 arcade game developed and published by Bally Midway.[1] Starbases, moons, ships, and space cities are infested with aliens, and the players have to kill the aliens before each is completely overrun. Xenophobe can be played by up to three players, and the goal of each level is to defeat all the aliens before time runs out. Some rooms routinely display the percentage of alien infection and time remaining until self-destruct when the level ends (but a nearby button can temporarily deactivate the count-down). Levels may contain more than one floor, and players use elevators (and sometimes holes in the floor) to move between floors to defeat all of the aliens. Players can also pick up more powerful weapons and other items to help in their eradication of the aliens.