Wrath Of The Black Manta

Invincibility:
In the Japanese version, press B(2), Select, A, Up, Select, Right, Start before the title screen appears. The word "MUTEKI" will appear to confirm correct code entry.

Switch skills during game play:
Press Select during game play and change skills as if you were at the start of the game. Note: This cannot be done while fighting a Boss.
Information in this section was contributed by Robert Essen.

Hint: Secret walls:
Shoot five to ten times at each wall in each position to find secret rooms.
Information in this section was contributed by Robert Essen.

Hint: Energy refill:
Enter rooms that do not have a kid in them and defeat all the enemies to get your energy refilled.
Information in this section was contributed by Robert Essen.

Hint: Defeating El Toro:
Use the Fire Bomb, Fire Ring, lightning, and missiles (in that order).
Information in this section was contributed by atx reprezinta.