67		Zork: Grand Inquisitor (Windows, 1997)
60		Enchanter (DOS, 1983)
60		Wishbringer (DOS, 1985)
60		Sorcerer (DOS, 1984)
60		Spellbreaker (DOS, 1985)
60		Zork Zero: The Revenge of Megaboz (DOS, 1989)
56		Zork Nemesis: The Forbidden Lands (DOS, 1996)
56		Zork Nemesis: The Forbidden Lands (Windows, 1996)
53		Zork: The Great Underground Empire (DOS, 1982)
52		Dungeon (DOS, 1987)
45		Leyendas de Lhodrye: La Luz del Druida (DOS, 1997)
45		Leyendas de Lhodrye: Arakhas el Oscuro (DOS, 1997)
44		Once and Future (DOS, 1998)
44		Once and Future (Windows, 1998)
44		4K Adventure (DOS, 1998)
43		The New Castle (DOS, 1999)
43		Adventure in Humongous Cave (DOS, 1993)
43		Die Höhlenwelt Saga: Der Leuchtende Kristall (DOS, 1994)
42		Pentari: First Light (Windows, 2003)
42		The Dreamhold (Windows, 2005)
42		Beyond Zork: The Coconut of Quendor (DOS, 1987)
42		To Be or Not To Be (Windows, 2015)
42		Pentari: First Light (DOS, 2003)
41		Sorcerer of Claymorgue Castle (DOS, 1993)
41		A Journey Into Xanth (DOS, 1993)
40		Myth (DOS, 1989)
40		Legacy of the Necromancer: Part I - The Adventurers' Museum (DOS, 1989)
40		Advanced Xoru (DOS, 1989)
40		Legacy of the Necromancer: Part II - The Palace of the Necromancer (DOS, 1989)
40		Fire From Heaven (DOS, 2005)
40		The Usurper: The Mines Of Qyntárr (DOS, 1989)
40		Generic Adventure 551 (DOS, 1990)
40		Das Stundenglas (DOS, 1990)
40		Versus: The Elite Trials (Windows, 2016)
40		Castle Elsinore (DOS, 1992)
40		The Awe-Chasm (DOS, 1991)
40		Venom (DOS, 1987)
40		Alabaster (Windows, 2009)
40		Choice of Romance: Affairs of the Court (Windows, 2016)
40		The Sea Eternal (Windows, 2016)
40		The Hermit's Secret (DOS, 1982)
40		Search for the Ultimate Weapon (Windows, 2008)
40		ADV770 (Windows, 2008)
40		Dracula: Love Kills (Windows, 2011)
40		Spellcaster: The Forgotten Spell (Windows, 2014)
40		Spectrum Adventure (Windows, 2007)
40		Azada: Ancient Magic (Windows, 2008)
40		Zork II: The Wizard of Frobozz (DOS, 1982)
40		Zork III: The Dungeon Master (DOS, 1983)
40		Shard of Inovar (DOS, 1987)
40		Adventure (DOS, 1987)
40		Lancelot (DOS, 1988)
40		Adventure in the Magic Land (DOS, 1989)
40		Legend of the Sword (DOS, 1987)
40		Philosopher's Quest (DOS, 1987)
40		Dragonworld (DOS, 1984)
40		Nine Princes in Amber (DOS, 1985)
40		The Pawn (DOS, 1986)
40		Legacy of the Necromancer: Part III - The Dark Tower (DOS, 1989)

Notes: Games similar to Zork: The Undiscovered Underground, Games like Zork: The Undiscovered Underground, Activision, Inc., Activision, Inc., Windows, Adventure, Fantasy, Interactive Fiction, Text Adventure, Puzzle elements, Zork, PC, Game Similarities.