Gamma World D20 (6th Edition)

In November 2002, Sword & Sorcery Studios (SSS) announced that it had licensed the Gamma World setting from WOTC in order to produce a sixth version of the game. SSS's version of the game, which reached the market in 2003, used the d20 Modern system, and mimicked D&D's "three core book" model with three hardcover manuals.

Beyond the Horizon

2003 Sourcebook Gamma Terra Fantasy (Science Fantasy) Science Fiction (Post Apocalypse)

Cryptic Alliances & Unknown Enemies

2003 Sourcebook Gamma Terra Science Fiction (Post Apocalypse) Fantasy (Science Fantasy)

Gamma World Game Master's Guide

2003 Core Rules Gamma Terra Animal (Anthropomorphic) Fantasy (Science Fantasy) Science Fiction (Post Apocalypse)

Gamma World Player's Handbook

2002 Campaign Setting Gamma Terra Science Fiction (Post Apocalypse)

Machines and Mutants

2002 Sourcebook Gamma Terra Animal (Anthropomorphic) Fantasy (Science Fantasy) Science Fiction (Post Apocalypse)

Midnight in the Mystery Garden

Adventure

Out of the Vaults

2002 Sourcebook Gamma Terra Animal (Anthropomorphic) Science Fiction (Post Apocalypse) Fantasy (Science Fantasy)