Thief: The Dark Project is a 1998 first-person stealth game developed for Windows by Looking Glass Studios and published by Eidos Interactive. Set in a medieval steampunk metropolis called the City, the game follows Garrett—a thief trained by a secret society—as he undertakes missions to steal valuables. Thief was the first stealth game to use light and sound as gameplay mechanics, and the first to feature a first-person perspective; its use of this perspective for non-confrontational gameplay challenged the first-person shooter market. The game's design combines complex artificial intelligence with simulation systems to allow for emergent gameplay.