Zork is one of the longest running adventure game series around and this category covers the entire series.
"Enchanter" (1983) by Marc Blank and David Lebling, the first game in Infocom's Enchanter trilogy
"Sorcerer" (1984) by Steve Meretzky, the second game in Infocom's Enchanter trilogy
"Spellbreaker" (1985) by Dave Lebling, the third game in Infocom's Enchanter trilogy
"Wishbringer: The Magick Stone of Dreams" (1984) by Brian Moriarty of Infocom