Swordquest is an unfinished series of video games produced by Atari, Inc. in the 1980s as part of a contest, consisting of three finished games, Earthworld, Fireworld, and Waterworld, and a planned fourth game, Airworld. Each of the games came with a comic book that explained the plot, as well as containing part of the solution to a major puzzle that had to be solved to win the contest, with a series of prizes on offer whose total value was $150,000. The series had its genesis as a possible sequel to Atari's groundbreaking 1979 title "Adventure", but it developed mythology and system of play that was unique.