Zork I (Microcomputer Version) by Infocom
Mainframe Version of Zork (Infocom)
Zork III (Infocom)
Zork I (Microcomputer Version) (Solid-Gold Edition) by Infocom
Zork II (Microcomputer Version) (Infocom)
Deadline by Marc Blank (Infocom)
Enchanter (Zork IV) by Marc Blank and Dave Lebling (Infocom)
Border Zone, by Marc Blank (Infocom)
Journey, by Marc Blank, Illustrated by Donald Langos (Infocom)