2011 · 资料书（用于增强玩法的规则/选项）
Guide to Rocket Rangers
This supplement introduces a fictional military unit set a few years after the events of the Hollow Earth Expedition timeline. It provides rules for heroes equipped with rocket-packs and guns, taking to the skies in pulp-adventure style to fight Nazi forces. The Hollow Earth Expedition core book and Secrets of the Surface World are required to use these rules.
技能型（购买或获得技能）基于点数（分配点数以获得技能、能力等）骰子（主要为d2/硬币）
免费，支持网页、Android 和 iOS
用 Ludoya 玩 Guide to Rocket Rangers
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。