Who’s the best multi-game speedrunner in the world?
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You could make a large argument for anyone who's done the Super Marihour https://www.speedrun.com/mcmg#Super_Marihour
Or anyone who’s done the 3D Zelda Challenge (Gymnast, Sva, etc).
Or even someone like Cheese who has the 120 start WR in SM64 and at one time was I think Top 5 or Top 3 in OOT 100%.