Cars
All cars:
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At the Press Start screen, press Up(2), Down(2), Left, Right, Left,
Right, B, A, B to unlock all cars.
Bonus song:
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At the Press Start screen, press Up, Down, Up, Down, A, B, X, Y to
unlock a bonus song for Romones Style.
Pistons Cup: Shortcut:
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When about to finish the last lap, jump just before the finish line.
That will lead you to the finish.