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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.

Cube attack (Gradius 3)

Reach stage 9 in the game to unlock cube attack in extra mode.

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.

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.

Boss rush mode (Gradius 4)

Successfully complete the game to unlock boss rush mode.

Stage select (Gradius 4)

Successfully complete the game without using any continues to unlock stage select.