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. Hold Down Start to be invincible, A to square
off against the Fighter Ace, B to fight the Super Carrier, and C to battle
the Last Fighter. You have to hold Down the button until the area begins.
Note that you can hold Down Start with any of the others. For example,
hold Down Start and C to take on the Last Fighter and be invincible.