Unlock Bonuses:
After pausing the game HOLD L1 + L2 + R1 + R2 and press Down, Up, Down, Up, Left, Right,
Left, Right.

Unlock Unlimited Combo Meter:
After pausing the game HOLD L1 + L2 + R1 + R2 and press Left, Right, Up, Down, Right, Left,
Down, Up.

Unlimited Health:
After pausing the game HOLD L1 + L2 + R1 + R2 and press Up, Right, Down, Left, Up, Left,
Down, Right.

Unlock All Upgrades:
After pausing the game HOLD L1 + L2 + R1 + R2 and press Up, Up, Left, Left, Right, Right,
Down, Down.

Unlock Dark Knight Difficulty:
After pausing the game HOLD L1 + L2 + R1 + R2 and press Down, Left, Right, Up, Up, Right,
Left, Down.