Tools
A specialized splitter just for ACT runs in MKDD. (direct download)
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Timesheet linked to the Player's Page that calculates your rank and doubles up as a Time Calculator. (external link)
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Saves
This save file has the Barrel Train, Toad/Toadette/Toad Kart, Special Cup, and All Cup Tour unlocked. The reason Petey and King Boo should not be unlocked is that they tend to be in 2nd place during Grand Prix and will frequently throw triple red shells at you (as they have the ability to get any special item). (direct download)
Splits
Patches