All tracks:
Press A, Left(2), Right, Down, Z at the arcade mode screen. Alternatively, begin game play on Mirror Jungle track in practice mode and press A, B(2), A, B, A, Z, A during the race.

Mirror tracks:
Press Right, Up, Left, C-Down, Right, Down, Z after starting a race.

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

Rainbow mode:
Press C-Down, Z, B, Up(2), 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.

View completion date:
Hold C-Up + C-Down + C-Left + C-Right before the title screen appears. The date on the title screen indicates when the game was completed.

Alternate credits:
Select the "Credits" icon on the options screen. Press Left, C-Down, Right, Down, Z. A new credit screen featuring the Strip Mine will be displayed.

All cars:
Press A, Left(2), 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(2), A, Left(2), 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(2), Z, B, A, Left(2) 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(2), 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.