I already played through most of the game so might as well suggest some categories (includes possible spoilers):
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'Mario Party' All Boards ---- Subcategories: normal, hard, very hard, master ---- Rules: "Must win all 4 'Mario Party' boards. Timing starts when pressing A after choosing the amount of turns, timing ends when the characters name pops up when announcing the winner."
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Partner Party All Boards ---- Subcategories: normal, hard, very hard, master ---- Rules: "Must win all 4 Partner Party boards. Timing starts when pressing A after choosing the amount of turns, timing ends when the characters name pops up when announcing the winner."
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River Survival (subcategories: normal & hard - singleplayer & multiplayer & 1P2C, variables: normal oar & gold oar) ---- Subcategories: normal, hard - singleplayer, multiplayer, 1P2C ---- Variables: normal oar, gold oar (there is a notable difference between them but id say not enough to add a third subcategory) ---- Rules: "Must beat River Survival using any path. Timing starts when pressing A on choosing the raft side, timing ends when "Goal" appears."
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Challenge Road ---- Subcategories: normal challenges, master challenges ---- Rules: "Must beat all minigames in Challenge Road, skipping minigames is not allowed. Can be played on a already beaten file. Timing starts when pressing "Start", timing ends when "Clear!" appears on the final minigame." (might wanna add that they need to be beaten in order if that should be a thing - playing it on a new file shouldn't be required imo as you would need to unlock this mode again as you can't reset it)
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All Gems ---- Rules: "Must collect all 5 gems. Timing starts when pressing X after selecting a character, timing ends after the "You are a superstar" text appears after collecting the last gem."
