Enter the following at the Enter Password screen. You will then have to get all the flags on each level. Down, Y, Right, A, Right, Up, Right, B, A, Down, Start.
Enter the following at the Enter Password screen. Neither player will be it. Up, Y, A, Right, Up, Y, B, Down, Right, Down.
Enter the following at the Enter Password screen and then choose a two player game. At the world select screen you'll find three new worlds where you may race. A, Y, Right, X, Right, Up, Down, Y, Right, Down.
Access the 'Enter Password' screen, enter the password A, Y, A, Right, Down, Y, Up, Right, Right, A and press Start.
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