Press Up + B on controller two.
Press [Up, Right, Down, Left,
Up] four times at the copyright screen while the letters
are falling from the top of the screen. Then press Start
to enable invincibility. Alternatively, press Up, Right,
Down, Left, Up, Left, Down,
Nine lives; all weapons:
Press Start and wait until the title screen appears.
Then, hold A + Down and press Start to
begin game play.