Reversed tracks:
Win all races in first place under the normal difficulty setting. Return to the main menu and press Left, Start.

In-game reset:
Pause game play and hold A + B + C.

Modify tracks:
Enter the following codes on controller two at the track selection screen to activate the corresponding effect.

Effect	Code
Zoom in	Hold Start and press A.
Zoom out	Hold Start and press B.
Flip over	Hold Start + C and press Up or Down.
Move	Hold Start and press Left, Right, Up, or Down.