"Zork" is set in "the ruins of an ancient empire lying far underground". The player is a nameless adventurer "who is venturing into this dangerous land in search of wealth and adventure". The goal is to return from the "Great Underground Empire" alive with the treasures, ultimately inheriting the title of Dungeon Master. The dungeons are stocked with many novel creatures, objects and locations, among them grues, zorkmids, and Flood Control Dam #3—all of which are referenced by subsequent Infocom text adventures.