2003 · Non-Game Book (but RPG Related)
d20 System Trademark Guide
A reference guide outlining the formal guidelines and instructions third-party publishers use to produce compatible products.
Skill Based (buy or gain skills)Attribute/Stat Based (STR, CON, PER, etc)Level Based (Earn XP and level up)
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Game facts (players, playing time, age, credits) from BoardGameGeek.