Quote:
	
	
		
			
				
					Originally Posted by  Martian
					 
				 
				Zork had a number of sequels, the most recent in 1997. I've never played any of them, though. 
			
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 Yes, that's right. Neither did I beyond the original Infocom Trilogy:
Zork I: The Great Underground Empire (1980, Infocom)
Zork II: The Wizard of Frobozz (1981, Infocom)
Zork III: The Dungeon Master (1982, Infocom)
Then: 
Beyond Zork: The Coconut of Quendor (1987, Infocom)
Zork Zero: The Revenge of Megaboz (1988, Infocom, text with some graphics)
After a six year hiatus, the following games were produced:
Return to Zork (1993, Infocom/Activision, graphical)
According to Wikipedia, there was also the Zork Quest series:
 
Zork Quest: Assault on Egreth Castle (1988, Infocom, interactive computer comic book)
Zork Quest: The Crystal of Doom (1989, Infocom, interactive computer comic book)
I did purchase, play, and finish these Infocom Zork-related titles:
Enchanter (1983, Infocom)
Sorcerer (1984, Infocom)
There was also a science-fiction title I played:
Starcross (1982, Dave Lebling)
The complete list of all Infocom's interactive fiction 
titles is available at Wikipedia.