Enter the sound options, highlight "Mono", then hold X and press Right, Up, Right, Up, L1, R2, L1, R2.
Select the "End" command and highlight the first option. Then, hold X, press Right(4), L1, Up, Start, Right.
At the title screen, hold R1 and begin playing a mini-game. After completing the mini-game, hold X + Triangle at the summary screen to access all other mini-games.
When the SD character begins moving while the game loads, hold X and press Right, Up, Left, Up, Right, Down, Left, Up, Triangle.