2002 · 资料书（用于增强玩法的规则/选项）
Net Book of Classes, Tome 1
This optional d20 System supplement expands the available pool of character classes with community-created core and prestige classes. It also includes alternate rules, variants, and other player-character options that require Game Master approval before use.
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 Net Book of Classes, Tome 1
游戏信息（人数、游戏时长、年龄、制作人员）来自 BoardGameGeek。