Cheat mode: Press B(33), Start at the title screen.
A sound test option will be available. Additionally, nine continues
will be available when game play begins.
Super weapon: Press Up, Down, A, B, Start
at the title screen. You will start the game with the "Doom
Gun" that allows all onscreen enemies to be destroyed, at
the cost of two HP and three gun points.
Information in this section was contributed by w_western.
