2005 · 核心规则（开始对局的最低要求）
Perfect 20 Roleplaying System (2005 Edition)
A streamlined open-gaming fantasy roleplaying system using only d20 rolls. Characters advance through a non-class-based system, with simplified rules supporting adventure in a traditional fantasy setting.
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 Perfect 20 Roleplaying System (2005 Edition)
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。