While playing, pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.

After earning a highscore of 573,000 wait until you're at the demo screen with princess Merora, then hold R1 + L1 and you can use the D-Pad to select the stages. If you score 1,000,000 or higher, you can repeat this trick twice.

You can have fun and do it at the easiest setting with 9 stocks, then save your game.