Cars
At the "Press Start" screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, B to unlock all cars.
At the "Press Start" screen, press Up, Down, Up, Down, A, B, X, Y to unlock a bonus song for Romones Style.
The Daily Poll
At the "Press Start" screen, press Up(2), Down(2), Left, Right, Left, Right, B, A, B to unlock all cars.
At the "Press Start" screen, press Up, Down, Up, Down, A, B, X, Y to unlock a bonus song for Romones Style.