Invincibility
Press II to pause the game during play and enter this master cheat: B, A, C, C, A, A, and X.
Press II again, enter any of the codes below, and then press X. You can use the missile power-up and smart bomb only once per mission.
Invincibility: A, B, A, C, A, A, B, A. "Invincible" message appears.