Arthur: The Quest for Excalibur is an illustrated interactive fiction computer game written by Bob Bates and published by Infocom in 1989. Typically for an Infocom title, it was released for many popular computer platforms of the time, such as the Macintosh, PC, and the Apple II series. Quite atypically for an Infocom product, it featured illustrations of locations, characters and objects within the game. It is Infocom's thirty-fourth game and is the second of two Infocom games developed by Challenge, Inc. using Infocom's development tools.