Configuration screen
Press [A] + [Start] before game play begins to display a configuration screen with control, ship, difficulty, and sound test options.
Ninety-nine ships
Set the "Ship Stock" option on the configuration screen to "0".
Bonus music
Complete the game to display additional selections on the music test option of the configuration screen.
All weapons
Pause game play and press [Up], [Right], [A], [Down], [Right], [A], [C], [Left], [Up], [B]. Press [C] to add a weapon. Press [Down] to remove a weapon. Press [Up] to add all weapons. Press [Right] to add or remove the claw.
Control high score screen
Use the D-Pad when creating a high score entry to control the movement of the stars.