Odyssey: The Compleat Apventure

Odyssey: The Compleat Apventure is a videogame written by Robert Clardy and released by Synergistic Software in 1980. It was created for the Apple II platform and is considered one of the first microcomputer-based role-playing games. The title was intentionally misspelled; "Apventure" is a reference to the Apple computer.

Although primitive by today's standards, Odyssey was considered cutting-edge for its time, making use of the Apple II's two graphics modes (high-resolution and low-resolution), and text. The game was written in Integer BASIC and was one of the first microcomputer games to be created using multiple programs, requiring floppy disc activation and access mid-game. (This feature, however, led to a way in which the player could cheat: by removing the disk when the computer required access, a cursor flashes on screen; typing "goto 770" would fool the computer into thinking that the player had just opened up a treasure box. This is one of the earliest known examples of a cheat code.) Prior to this, most games were self-contained, single programs; Odyssey was split into several different programs and took up an entire disk. The game also made use of rudimentary sound effects.

A forerunner of Akalabeth and Ultima, Odyssey is a multi-part adventure game that places the player in the role of the leader of an army who sets out to vanquish an evil wizard. Elements of can be found within the game, which combines elements of two earlier games written by Clardy: Dungeon Campaign and Wilderness Campaign.