Space Invaders
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Level select
At the main menu, select either one or two players and press Circle (instead of X) to begin the game. Then a selection screen that allows any level, including planet Mercury with a new power-up and an "Alien World" featuring the best background in the game will appear.
Classic mode and credits
Enable the "Level select" code, choose level 00, and complete it to unlock an ending, classic mode, and credits. Press Right when selecting then number of players to access classic mode. Enter the options screen to access the credits.
Nine lives
Pause the game and quickly press Right(3), Down, Circle, Left, Down.
Five shots
Pause the game and quickly press Down, Left, Circle, Down, Right(3).