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d20 system

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The d20 system is the game engine that certain pencil and paper RPGs such as Dungeons & Dragons or d20 Modern use. It is called such because most of the games rolls are based on a d20. The d20 system is also the basis on which the Open Gaming Licence, a ruleset that is free for anyone to use, is based on.

External Links

The official website for the d20 and Open Gaming Licence systems

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