Laser Weapon
Pause the game and enter:
UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, X, CIRCLE
You will be at full power with the laser weapon.
Cheats
You must first beat the first boss and then you can enter the codes. You will only be able to enter the codes once per beaten level. So if you beat two levels without using the code you will be able to use 2 times on the next level. Or you can save them and use them all in one level.
Double Weapon
First pause the game and enter:
UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, SQUARE, TRIANGLE
Now you will be at full power with double weapon.
Extras in Gradius IV
Beat the entire game once to unlock the Boss Rush Mode.
If you beat the entire game with out continuing you will unlock the Stage Select feature.
Hidden Modes, Gradius III
Once you reach Stage 9, the extra mode will appear. You will now be able to play Cube Attack.
If you get hit with a bullet from a big boss during Stage 10 you will get levels from the first Gradius. If you play them once you will always have access to them.
Once you beat the game once you will unlock the Extra Edit. This can be found in the Extra Mode.
Beat the game in Extra Edit Mode to have access to more weapons.
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