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Games based off novels!
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
Parasite Eve immediately comes to mind for me. But I’ve only played the first game. As far as I can tell it’s a more loosely-based interpretation with different characters and it was not done with the author’s approval, but I still really liked it.
PE is great! The second game is good too.