Gradius 3 Cheats

Use one of the following codes...

Choose "speed down" for the "!" option in the weapon select screen,
if you can get enough power ups to highlight the last weapon, which will not be visible, and using it without powering up on speed up, you will get all four options, missiles, and the shield. But if you have the laser already, it will be taken away.

Activate the R-Option and collect enough power-ups so that the option selection is highlighted. Now press and hold the A button.

Continue to hold A through the initial demo, and you'll see the entire first stage including the boss.

The Final Boss, Bacterion, will die regardless of whether you attack it or not. Just dodge his blasts, and in fifteen or so seconds, he will spontaneously die. Even cheaper, park your ship in the bottom center of the screen, and the shots can't aim towards you!

There is a bonus stage located in the game. It is located in Level 2. When you fly into the section that is lined with the blue bubbles, look for a hole in the bottom and go in it.