Full Double Shot Power-Up:
After pausing, press Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle.
You will hear a sound to confirm correct entry of the cheat.
Full Laster Shot Power-Up:
After pausing, press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
You will hear a sound to confirm correct entry of the cheat.
Cube Attack (Gradius 3):
Get to Stage 9 to unlock Cube Attack in Extra Mode.
First Gradius Stage (Gradius 3):
Let the Stage 10 boss hit you with a shot and the first Gradius Stage
will be unlocked in Extra Mode.
Extra Edit Mode (Gradius 3):
Either play the game for ten hours or complete it to unlock Extra
Edit Mode.
Boss Rush Mode (Gradius 4):
Complete the game to unlock this mode.
Stage Select (Gradius 4):
Finish the game without the aid of any continues to unlock this mode.
