The Hive Alien faction had the Face Hugger, Drone, Queen, and Empress classes.In later versions of the game, the Marines could also drop proximity mines. Marines' equipment included the motion detector from the film Aliens, which was their sole method to locate Aliens, but would not locate Aliens which were not moving. More advanced weaponry were available when grouping as a 'fireteam,' and increased hit points became available as a character progressed in rank. The Colonial Marine faction had the Medic, Scout, Soldier, and Heavy Weapons classes.

Scenarios were played in one of six different maps, with three more added over the game's lifespan. Players could fight on either the side of the United States Colonial Marines or on the side of the Aliens.

Gameplay Īliens Online included asymmetric teams, teams consisting of more players than found in most first-person shooters of its era, job/class specialization, and RPG elements. It was based on the science fiction horror film Aliens. Aliens Online was a 1998 massively multiplayer first-person shooter video game released for Microsoft Windows.

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