Ultima Underworld: The Stygian Abyss (PC/DOS) 1992, Origin Systems

"Ultima Underworld: The Stygian Abyss" is a first-person role-playing video game (RPG) developed by Blue Sky Productions (later Looking Glass Studios) and published by Origin Systems. Released in March 1992, the game is set in the fantasy world of the Ultima series. It takes place inside the Great Stygian Abyss: a large, underground cave system that contains the remnants of a failed utopian civilization. The player assumes the role of the Avatar—the Ultima series' protagonist—and attempts to find and rescue a baron's kidnapped daughter.

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. Its design combines simulation elements with concepts from earlier CRPGs, including Wizardry and Dungeon Master, which led the game's designers to call it a "dungeon simulation". As such, the game is non-linear and allows for emergent gameplay.
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"Ultima Underworld is one of the best games in the Ultima series! IMO, The most nostalgic masterpiece.. -Thriftweed "