| Boss Rush Mode (Gradius 4) |
| Successfully complete the game to unlock boss rush mode. |
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| Cube Attack (Gradius 3) |
| Reach stage 9 in the game to unlock cube attack in extra mode. |
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| 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. |
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| 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. |
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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. |
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| 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. |
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| Stage Select (Gradius 4) |
| Successfully complete the game without using any continues to unlock stage select. |
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