Starlight Scramble Codes -

All cards:
Enter the sound options, highlight "Mono", then hold L1 and press Up, Down, Up, Down, Square, Triangle, Square, Triangle.

Bio Rhythm:
Select the "End" command and highlight the first option. Then, hold L1, press Up(4), Square, Down, R2, Up.

All mini-games:
Hold Select at the title screen and begin playing a mini-game. After completing the mini-game, hold L1 + Circle at the summary screen to access all other mini-games.

Inner mode:
Hold L1 and press Up, Down, Right, Down, Up, Left, Right, Down, Circle when the SD character begins moving while the game loads.