The wall panels were digitized from models. The Marine was the most fun – we actually got one of the Alien's movie costumes and photographed one of the gang wearing it. We purchased high-quality kits of the Alien and the Predator, airbrushed them, and used stop-frame photography and digitization to achieve the desired animation. Whittaker recounted how the game's artwork and graphics were produced: Level design, sound effect design and sound programming were completed largely by Atari staff drafted onto the project in its later stages, as it became clear that the scope of the game was leading to significant release delays. All in-game artwork was by Rebellion (additional intro and outro artwork by Atari). The game system and gameplay were programmed by Mike Beaton (3D graphics engine, gameplay engine) and Andrew Whittaker (alien AI). As Lewis, the player can use both air ducts and elevators to access new levels of the base.
Available weapons include a shotgun, pulse rifle, flame thrower, and smart gun. Lewis can use medical kits to recover health, but cannot carry them and must use them immediately. The player must find weapons and security cards in order to fend off enemies and access new levels of the base, activate the base's self-destruct mechanism, and escape in the escape pod. At the start of the game, Lewis is in the base's brig and has no weapons, motion tracker, or security clearance. When playing as Private Lewis, the player's goal is to escape a military base which has been invaded by Aliens and Predators. Killing an enemy while visible, conversely, results in an increase in honor points which in turn allows access to more weapons. Killing an enemy while invisible results in a loss of honor points, which can in turn result in losing equipped weapons. Weapons and scoring are based on how the Predator kills enemies. The Predator can use elevators to travel between levels, carry medical kits and use them to recover health, and use a cloaking device to become invisible.
The Alien is unable to use elevators and instead travels between levels of the ship through air ducts.Īs the Predator, the player's objective is to reach and kill the Alien queen in order to claim her skull. The Alien is unable to heal itself from injuries and instead "cocoons" marines if the Alien dies a cocooned marine will become a new Alien, allowing the player to continue from that location. The player must fight numerous marines and Predators through various sublevels of the ship in order to reach the Queen. When playing as the Alien, the player's objective is to rescue the Alien queen, who is being held captive on a Predator spaceship. Each player character has its own scenario, weapons, and abilities. The game is a first-person shooter which takes place on flat plane environments with two-dimensional sprites.