Gradius 3 and 4: Mythology Of Revival Cheats

Unlock instant double shot power-up:
After passing the first boss, pause your game, and push Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle. You will hear a sound if you have entered the code correctly. You can only do this 25 times (amount of levels in the game) If you want to power-up for player two, push Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle, Select, Start.
 

Unlock instant laser shot power-up:
After passing the first boss, pause your game, and push Up, Up, Down, Down, Left, Right, Left, Right, X, Circle. A sound will confirm correct code entry. You can do this up to 25 times. If you want to power-up for player two, press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle, Select, Start.
User Cheat by CaptainCrunch  

Extra Edit mode:
Finish or get ten hours of game play in Gradius 3 to unlock an "Extra Edit" option. 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.
User Cheat by CaptainCrunch

Cube Attack mode:
By reaching level 9 in Gradius 3 you will unlock Cube Attack.

Original Gradius levels:
Intentionally allow a Boss in level 10 in Gradius 3 to hit you to unlock levels from the original Gradius. The original levels will also be unlocked in extra mode.

Boss Rush mode:
After finishing Gradius 4 you will unlock Boss Rush mode.

Stage select:
After finishing Gradius 4 without using any continues you will unlock the Stage Select option for that game.

Gradius III and IV Code Breaker Codes

Gradius III and IV GameShark V2 Codes (NA)

Gradius III and IV GameShark V3 Codes (NA)

Gradius III and IV Pro Action Replay Codes (NA)

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