Gradius 3 and 4: Mythology of Revival Cheats - PlayStation 2

Instant double shot power-up
Pause the game play after passing the first Boss and press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [Square], [Triangle]. A sound will confirm correct code entry. Note: This may only be up to 25 times, equal to the number of levels that have been successfully completed. Note: To this power-up for player two, press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [Square], [Triangle], [Select], [Start].

Instant laser shot power-up
Pause game play after passing the first Boss and press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [X], [Circle]. A sound will confirm correct code entry. Note: This may only be done up to 25 times, equal to the number of levels that have been successfully completed. Note: To use this power-up for player two, press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [X], [Circle], [Select], [Start].

Extra Edit mode
Successfully complete or accumulate 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.

Cube Attack mode
Reach level 9 in Gradius 3 to 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
Successfully complete Gradius 4 to unlock Boss Rush mode.

Stage select
Successfully complete Gradius 4 without using any continues to unlock the Stage Select option for that game.