"Zork III: The Dungeon Master is an interactive fiction computer game written by Marc Blank, Dave Lebling, Bruce Daniels and Tim Anderson and published by Infocom in 1982. It was the third game in the popular Zork trilogy and was released for a wide range of computer systems. It is Infocom's fourth game." Source: Wikipedia, "Zork_III," available under the CC-BY-SA License.