2003 · 资料书（用于增强玩法的规则/选项）
Into the Black: A Guide to Below
This roleplaying supplement explores an underground realm where plants, animals, and other creatures survive without sunlight. It describes the environment and its ecology, along with new monsters, races, magic items, and other materials for players and game masters to use in subterranean adventures.
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 Into the Black: A Guide to Below
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。