If you are looking for "pieces" in the sense of campaign content or modules, here are the core classics:
For , you are likely looking for the vintage Grenadier 20 Metal Miniatures Set , which was specifically released to provide pieces for the game. Miniatures & Game Pieces Gamma World Adventures
: Known for its iconic "Escape from the Badder Warren" sequence, which many DMs use as a standalone mini-delve . If you are looking for "pieces" in the
: These cards are the primary mechanical "pieces" of the 2010 edition. Players draw random mutations at the start of encounters, and Omega Tech devices are used as temporary powerful gear. To help you find the right item, Players draw random mutations at the start of
: The Legion of Gold Expansion Pack includes four additional sheets of mutant monster tokens to expand your table presence. Adventure Modules & Supplements