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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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$4.95

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5.00 (from 1 reviews)

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https://parts-per-million.itch.io/colo-core - @ppmgamer