Level select:
Hold L + R and press Down, Up, Left(2), Up, Right(3), click Left Analog-stick at the main menu. A sound will confirm correct code entry.

All characters:
Hold L + R and press Left, Up, Down, Right, Up, Down, Up, Right, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

All bikes:
Hold L + R and press Down, Up, Right(6), click Left Analog-stick at the main menu. A sound will confirm correct code entry.

Extra life:
Hold L + R and press Y, A, X, B, Up, Left, Down, Right, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

Shield:
Hold L + R and press Left, Right, X, B, Y, A, Up, Down, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

Anti gravity:
Hold L + R and press Up(2), Left, Right, Up(4), click Left Analog-stick at the main menu. A sound will confirm correct code entry.

Magnet pegs:
Hold L + R and press Y, Up, Y, Up, Y, Down, Y, Down, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

Super spin:
Hold L + R and press Left, Up, Right, Down(2), Right, Up, Left, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

All songs:
Hold L + R and press Right(6), Up, Down, click Left Analog-stick at the main menu. A sound will confirm correct code entry.

All FMV sequences:
Hold L + R and press Right, Up, Down(2), Up, Right, Down(2), click Left Analog-stick at the main menu. A sound will confirm correct code entry.