All cars
Press (A), [Left]x2, (C-Down), (A), [Right], (Z) at the arcade mode screen. Note: The bonus cars will not be enabled by this code. For the Japanese version of the game, hold (L) + (R) and press ((C-Left) + (C-Right) + (C-Up) + (C-Down)) four times at the car selection screen.

Beach ball car
Press (B)x2, (A), [Left]x2, (C-Down), (A), [Right] at the arcade mode screen.

Cupra car
Press (C-Down), [Up], (B), [Right], (A), (C-Down), (A), [Right] at the arcade mode screen.

Helmet car
Press [Up]x2, (Z), (B), (A), [Left]x2 at the arcade mode screen.

Milk truck
Press [Down], (A), [Right], (Z), [Right], [Up], (C-Down) at the arcade mode screen.

Black or white cars
Highlight a car, hold (L) + (R) + (C-Up) + (C-Down) + (C-Left) + (C-Right), and press [Up] or [Down].

Modify car color
Hold (C-Left) (for red), (C-Right) (for blue), and/or (C-Up) (for green), then press [Up] or [Down] to increase or decrease the corresponding color(s). For other colors, press (C-Left) + D-pad or (C-Down) + "D-Pad" or (C-Right) + "D-Pad".

Mirror finish cars
Begin a race and press [Right], [Up], [Left], (C-Down)x2, (A), [Right], (Z). Exit the race and start a new race. Then, press (C-Down) at the decal screen, which is the last option before the race begins. Alternatively, press (C-Down) at the car selection screen after completing all six seasons of year five.

Disable Bi-linear filtering
Press: (B), [Left], [Right], [Up], [Left], (Z), [Right] during game play.

Rainbow mode
Press (C-Down), (Z), (B), [Up]x2, [Right] during game play. Note: For the Japanese version of the game, press Enter (C-Down), (Z), (B), "Up Down", (R) at the title screen.

All tracks
Press (A), [Left]x2, [Right], [Down], (Z) at the arcade mode screen. Alternatively, begin game play on Mirror Jungle track in practice mode and press (A), (B)x2, (A), (B), (A), (Z), (A) during the race.

Mirror tracks
Press [Right], [Up], [Left], (C-Down), [Right], [Down], (Z) after starting a race.