Ultima Underworld sold nearly 500,000 units, and was placed on numerous hall of fame lists. As such, the game is non-linear and allows for emergent gameplay. Its design combines simulation elements with concepts from earlier role-playing video games, including Wizardry and Dungeon Master, which led the game's designers to call it a ' dungeon simulation'. Ultima Underworld has been cited as the first role-playing game to feature first-person action in a 3D environment, and it introduced technological innovations such as allowing the player to look up and down. The player assumes the role of the Avatar-the Ultima series's protagonist-and attempts to find and rescue a baron's kidnapped daughter. It takes place inside the Great Stygian Abyss: a large cave system that contains the remnants of a failed utopian civilization. Released in March 1992, the game is set in the fantasy world of the Ultima series. Ultima Underworld: The Stygian Abyss is a first-person role-playing video game developed by Blue Sky Productions (later Looking Glass Studios) and published by Origin Systems.

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