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Alien Trilogy is a first-person shooter video game released in 1996 for the MS-DOS platform. Developed by Probe Entertainment and published by Acclaim Entertainment, it is a licensed title based on the first three films in the Alien science fiction series. The game presents its science fiction and horror themes from a first-person perspective.

Players assume the role of Lieutenant Ellen Ripley, navigating through environments inspired by the films. The primary objective is to survive and complete missions across various levels, which often involve reaching specific locations or activating systems. Gameplay is structured around exploring maze-like industrial and alien-infested complexes, collecting keycards and weapons, and managing limited resources such as health and ammunition. Players encounter hostile creatures including facehuggers, chestbursters, and adult Xenomorphs, with combat serving as a central mechanic for progression.

The game's progression is level-based, with players advancing through distinct stages that increase in complexity. In addition to standard enemies, players will confront larger threats such as the Alien Queen, which acts as a significant adversary. The experience integrates elements of atmospheric exploration with tense combat scenarios, requiring players to navigate dark corridors and react to ambushes. The structure emphasizes a linear path through the game's environments, with objectives tied directly to the settings and characters from the source material.