A seminal immersive sim (1994) blending first-person action and RPG systems aboard the Citadel Station under the tyrannical AI SHODAN.
- Developer/Publisher: LookingGlass Technologies / Origin Systems
- Platform/Year: MS-DOS (1994); enhanced editions on modern platforms later
- Genre: Immersive sim / FPS-RPG hybrid
- Core systems: Freeform exploration, hacking, environmental storytelling, inventory and cybernetic upgrades
- Notable: Pioneer of the immersive sim lineage influencing Deus Ex, BioShock, and Prey