Level Select
Hold R and press Up(9) on the title screen when the current difficulty level is displayed. A sound will confirm correct code entry. Begin game play and press Start to pause. Hold R + A + Select. A number will appear in the lower left corner of the screen. Press Up or Down to select a level.
Low Volume Music
Enter the sound test screen and play a selection. Press R to lower the volume.
Full Power-Up
Enter Down, R, Right, Down, Right(2), Down, Right, Down(2) at the title screen. A sound will confirm correct code entry. Begin game play and press Start to pause. Press R, Right, Down, Y, Down, Right, Down, Left, Right, Down, Right(2). Select one of each weapon class by pressing one of the following buttons. Note: Only one choice may be made for each weapon class.
Button Normal Attack Button Missiles and Bombs A Sky Laser A Homing Missiles B Ground Laser X Spread Bomb X Reflect Laser Y Spread Laser R Shotgun Bomb