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In page Gamma World:

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The third edition of Gamma World was a boxed set, credited to James M. Ward. This version of the rules became notorious for the number of editorial mistakes, including cross-references to rules that didn't appear in the boxed set. The errors were serious enough that TSR published a Gamma World Rules Supplement containing the "missing" rules. The Rules Supplement was sent to gamers who requested it by mail, and included in reprintings of the boxed set.[citation needed]