Ultima Underworld: The Stygian Abyss

	Blue Sky Productions
	Origin Systems
	MS-DOS
	March 21, 1992
	https://en.wikipedia.org/wiki/Ultima_Underworld:_The_Stygian_Abyss
	https://www.mobygames.com/game/ultima-underworld-the-stygian-abyss
	https://tcrf.net/Ultima_Underworld:_The_Stygian_Abyss_(DOS)
	Ultima Underworld 2: Labyrinth of Worlds (wikilink to game, etc.)

Ultima Underworld: The Stygian Abyss is a 1991 CRPG and early immersive sim.