Here are some cheats and tips for the game Parodius.
Full weapons:
Pause game play and press Up, Up, Down, Down, Left,
Right, Left, Right, II, I.
Extra continues:
Press I ten times at the title screen for an extra continue.
A total of nine continues can be accumulated with this code.
Twenty-nine lives:
Hold Left and press II, II, II, Run at the title screen.