2003 · 核心规则（开始对局的最低要求）
d20 Modern System Reference Document
An open reference document for the d20 Modern roleplaying system, providing rules and game content for contemporary adventure settings. It is organized by topic and supports the creation of compatible third-party supplements and independent roleplaying games. The material was originally distributed as separate files or grouped archives, with licensing documents and introductory guides provided separately.
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）
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