The 2D20 System Reference Document, published by ModiPHIuS in March 2023, contained all the core
rules for the underlying 2D20 system regardless of setting or genre. I am using it to write Solo
Core and Solo Playing games that fit a specific game's needs seamlessly within my own tool set while
maintaining the solidity of the base structure provided by this reference document. The Print+PDF
combination is available from PMgames at
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