Ghost Battle

During play, pull down on the joystick and press 'P' to pause the
game.  You should still be in the crouched position when the game is
paused.  Now type "ERWIN IS THE BEST" for infinite lives.  
Now use the following keys during play:

F6    Smart bomb.
F7    For a shield.
F8    Freeze enemies for a short time.
F9    ?
HELP  Skip to next level.