Cheat mode:
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.

Unlock The Riddler:REMEMBER: 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.

Extra strength:
Pause your game and press Up, Down, Left, Right, Up(2), Down(2), Left. The sound of an explosion will confirm correct code entry.

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.