E

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Post in the forums/Discord for the game you want the category added for. Doing a proof-of-concept run of your proposed category before suggesting it is generally recommended. Be prepared for disappointment though, most games are not looking to add new categories unless there's a reasonable amount of competition in them.

If you mean adding a game that isn't already on the site, this is what you're looking for: https://www.speedrun.com/knowledgebase/supporthub/request-game-or-series