Successfully complete the game to unlock boss rush mode.
Cube attack (Gradius 3)
Reach stage 9 in the game to unlock cube attack in extra mode.
Extra edit mode (Gradius 3)
Successfully complete or accumulate ten hours of game play in Gradius 3 to unlock an "Extra Edit" option in extra mode. This option allows weapon combinations to be edited. More weapons can be unlocked for editing by completing the game a second time, or by accumulating another ten hours of game play.
First Gradius stage (Gradius 3)
Reach stage 10 and let the Boss hit you with a bullet to unlock the first Gradius stage in extra mode.
Full Double Shot Power-Up
Pause gameplay and press Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle. You can only do this a couple times.
Full Laser Shot Power-Up
Pause gameplay and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle. You can only do this a couple times.
Stage select (Gradius 4)
Successfully complete the game without using any continues to unlock stage select.
