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What are the best games to mod?
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
The older Total War games have a ton of great mods, Medieval 2 in particular. There's a ton of amazing mods, both historical (like The Italian Wars for pike-and-shot action) and fantasy (like the LOTR mod, Third Age: Total War).
The various Paradox grand strategy games are great too.