2004 · 资料书（用于增强玩法的规则/选项）
Gearbook: Low Level Hell
This seven-page PDF provides reference material on the AH-1W attack helicopter, beginning with the development and evolution of the AH-1 Cobra, the first dedicated attack helicopter. It focuses on the model used by the U.S. military and gives Game Masters background and technical details to incorporate into d20 Modern campaigns and scenarios.
技能型（购买或获得技能）基于属性/数值（STR、CON、PER 等）等级制（获得经验值并升级）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Gearbook: Low Level Hell
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。