If you push the following code at the beginning of the game (on the main screen), then you will be invincible.
Effect Code Invincibility [II], [I], [I], [II]
Contributed By: pianistman.
After the "Mission Summary" screen, hold Select until the screen turns black. Then press any of the following button combinations to go to the desired level:
Effect Code Level 1-2 II Level 1-3 II, II Level 1-4 II, II, II Level 2-1 I Level 2-2 I, II Level 2-3 I, II, II Level 2-4 I, II, II, II Level 3-1 I, I Level 3-2 I, I, II Level 3-3 I, I, II, II Level 3-4 I, I, II, II, II Level 4-1 I, I, I Level 4-2 I, I, I, II Level 4-3 I, I, I, II, II Level 4-4 I, I, I, II, II, II
Contributed By: HyperSilence.
Effect Code Sound test At the title screen, hold down Select
Contributed By: SSnesVegita.
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