Zork Zero

Zork Zero: The Revenge of Megaboz is an interactive fiction video game, written by Steve Meretzky over nearly 18 months and published by Infocom in 1988. Although it is the ninth and last Zork game released by Infocom before the company's closing, Zork Zero takes place before the previous eight games (Zork I, Zork II, Zork III, Enchanter, Sorcerer, Wishbringer, Spellbreaker and Beyond Zork). Unlike its predecessors, Zork Zero is a vast game, featuring a graphical interface with scene-based colours and borders, an interactive map, menus, an in-game hints system, an interactive Encyclopedia Frobozzica, and playable graphical mini-games. The graphics were created by computer artist James Shook. It is Infocom's thirty-second game.

Previous games by Infocom used a parser evolved from the one in Zork I, but for Zork Zero, they designed a new LALR parser from scratch.Zork Zero's parser has some innovative features. If it notices if a player is having trouble with it, it offers helpful suggestions, such as sample commands.