2008 · 核心规则（开始对局的最低要求）
Hollow Earth Expedition Free Adventure
This introductory roleplaying adventure sends players into the Hollow Earth, where they encounter Nazis, dinosaurs, and lost civilizations in a pulp-inspired setting. The booklet includes the rules needed to play through the short scenario, providing a sample of the Ubiquity Roleplaying System. A full core rulebook is required for longer adventures and campaigns.
场景 / 冒险 / 模块技能型（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 Hollow Earth Expedition Free Adventure
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。