More Difficulty Levels
At the Game Start screen, hold X and press Z, C, L, B, Left, R, L.
Nine Continues
At the Game Start screen, press X, A, L, R, Left, then hold L and press X, C, Z, A, Right, Right.
Rapid Autofire
At the Game Start screen, hold B and press Y, Right, Left, X, Z, L, R.
