Enter the following codes while holding L and R at the Press Start screen:
Infinite health:
Press Up, Right,
Up, Left, Down, Left, Down,
Right.
Endless combo meter:
Press Left, Right,
Down, Up, UP, Down, Right, Left.
Every upgrade:
Press Down, Up,
Down, Left, Down, Right, Up,
Down.
Every bonus:
Press Left, Down,
Left, Right, Left, Left, Down, Right.
Dark Knight difficulty setting:
Press Right, Up, Up,
Right, Left, Down, Right, Up.
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