Automatic weapons...
	Free play mode...
	Mirror mode...
	Unlimited ammunition...
	Unlimited credits...
	Wide effect ammuntion...

Complete story mode two times.

Everytime the player uses all credits in story mode, one credit is added. After nine credits, the credits change to free play mode.

Complete story mode without using any continues.

Complete story mode three times. Note: Enable automatic weapons on the third attempt.

Intentionally lose the game in story mode. The next time story mode is played, there will be one more credit available. The number of credits will be unlimited (free play mode) after the game is lost with nine credits.

Complete story mode four times. Note: Enable unlimited ammunition on the fourth attempt.