Free play mode:
Enter the adjust settings menu from the main menu. Select the "Miscellaneous" option, and highlight the "Credit Limit" selection. Hold Square + Circle + Triangle + X. The phrase "Free Play" will appear to confirm correct code entry. If the game settings are saved, free play mode will also be included.

Sixteen credits:
Set the credits to nine and start the game using controller two. Immediately press Start on controller one when player two's ship launches. Allow player two's ship to be lost. Player one will now have sixteen credits.

Unlimited continues (Japanese version):
Press Select during the game over countdown.

Mission select:
Enter the difficulty menu from the settings menu. Hold R1 + R2 + L1 + L2 +Start.

Hidden options:
Hold R1 + R2 + L1 + L2 during a game to display a hidden options menu. The screen resolution, position, and other options may be adjusted.

Demo control:
Hold L1 to control the ship during the Raiden I demonstration. Hold R2 to control the ship during the Raiden II demonstration.

Power-ups:
Find the slightly off color trees that are not initially destroyed by your ship's fire power. They are usually located on the right side of the screen. Approach these trees and keep firing into them until they explode. Capture the pixie that flies out of the explosion. When your ship is destroyed, a group of power-ups will be released.