Gradius III & IV Cheats
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Full Weapons (Gradius III and IV)
You can use this only once for each level you've completed.
Pause, then enter: Up,Up,Down,Down,Left,Right,Left,Right,X,O.
Full powerup with double shots (Gradius III and IV)
With this cheat you'll get a complete powerup; you'll have double shot instead of laser.
Pause, then enter: Up,Up,Down,Down,Left,Right,Left,Right,Square,Triangle
Extra Edit (Gradius III)
Finish the game once or play for at least ten hours. Extra Edit will become available. You can now edit a weapon combination from all the weapons.
