Invincibility
Enter the Level Select code, then hold Start while pressing the button for the level you wish to tackle. i.e., hold Start + C to take on the Last Fighter while invincible.
Level Select
On the Mission Select screen, move the cross-hair to a place on the map that's not an area. Hold Start and press A, B, C, B, A, A, B, C, B, A, B. Release Start and you will hear a soft ping. Now move the cross-hair to the area you wish to attack and hold A to square off against the Fighter Ace, B to fight the Super Carrier, or C to battle the Last Fighter. You have to hold the button until the area begins.
