| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Advanced Player's Guide | 978-1-58846-961-8 | 2004 | Bruce Graw · Patrick O'Duffy · Aaron Rosenberg · Jeffrey Quinn · Jeremy McHugh · Matt Milberger · Thomas Denmark |
| Gamma World: Cryptic Alliances & Unknown Enemies | 978-1-58846-966-3 | 2004 | Owen Stephens · Alejandro Melchor |
| Gamma World Player's Handbook: A Campaign Setting for d20 Roleplaying | 978-1-58846-069-1 | 2003 | Bruce Baugh · Ian Eller · Mikko Rautalahti |
| Night Horrors: Grim Fears | 978-1-58846-743-0 | 2008 | Stephen Dipesa · Matthew McFarland · John Newman · Alex Scokel |