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.