Press Left, Up, Left(2), A, B at the main menu to display a cheat menu with level select, single hit kill, and all weapons options.
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Play as The Riddler
Note: This code requires a six-button controller. Hold Up + X + B + A + C at the character selection screen. The Riddler will be controllable in training mode.
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Extra strength
Pause game play and press Up, Down, Left, Right, Up(2), Down(2), Left. The sound of an explosion will confirm correct code entry.
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Special moves
Homing Batarangs:
Press Down, Toward, B.
Bat Cuffs:
Press Toward(2), C.
Rocket Boots:
Press Toward, C, Toward, B, Toward, C.
Holographic Decoy:
Hold Down and repeatedly tap A.