An expansion disk released for the 64DD peripheral that adds multiple additional features when connected to the base game: - 12 new and more difficult courses in 2 new cups, DD-1 and DD-2, as well as an edited cup option. - A course editor, with 100 save slots, similar to the developer tool used to make the game's courses. - A vehicle editor, with 100 save slots, allowed front, rear and wing parts to be combined with different parameters to balance performance - Expanded time attack ghost feature, 3 available for each course - New music tracks and changed audio from mono to stereo - Some of the characters had new higher performance machines available Player created data could be shared/imported but without mouse or online support it was difficult to use. Character portraits might have been editable by swapping data with the Mario Artist 64DD games.