The fourth title in the series was to include the X-Men - this game was partly coded by Scott Adams but never saw the light of day as a published game, as Adventure International became bankrupt during its development in 1985.
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The games were designed by Scott Adams, developed and published by Adventure International and the first was originally released in 1984 for the Atari 800, Apple II, ZX Spectrum, Commodore 16 and Commodore 64 with the sequels being published each following year.