Cheat: 50 Extra Lives

To start with fifty lives, highlight "Erase Game" on the main menu, and press B, A, R, R, A, L. Keep in mind you must use the Classic Controller to do this.

Unlockable: Music Test

To access the in-game Music Test, highlight "Erase Game" on the main menu, and press Down, A, R, B ,Y, Down, A, Y, and Select. Keep in mind you must use the Classic Controller to do this.

Unlockable: Practice Bonus Rounds

To access Practice Bonus Rounds, press the following button combination during the intro on the Classic Controller: Down, Y, Down, Down, Y.

Hint: Shortcut in Mine Cart Run
As soon as you begin the mine cart mission do not speed up but drop directly off the first jump and you will fall into a barrel which will then shoot you to the near end of the mission.