

IANAL but I really doubt you can’t patent a game mechanic. Have you noticed the amount of “D&D clone” which aren’t SRD version but do use D20, classes, and level rather than original game mechanics?
You can’t come with an infinity of games mechanics and even assuming it’s legal to patent (I doubt-it) there is tons of previous art which would make the patent invalid. Even a very inovative game like Blade in the Dark re-use tons of concept from other games like reputation score, partial success, dice pools or clocks
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