Dark play:
Pause the game in arcade mode and press Up(2), Down(2), Left, Right, Left, Right, X, Circle.

Level select:
Earn a high score with at least 573,000 points in the game. Hold L1 + R1 and use the D-pad to select a starting level at the screen with Princess Merora. Note: Earn a high score with at least 1,000,000 points to use this feature twice.