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.
To unlock the 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.
To select a level enter the difficulty menu from the settings menu. Hold R1 + R2 + L1 + L2 +Start.