Batman: Arkham City - Armored Edition
Big Head Mode
Equip the Cryptographic Sequencer. Then, hold ZL and ZR. Move the left analog stick clockwise, and the right analog stick counterclockwise. After a while, your fists and head will grow.
Contributed By: Hylian_Gear_Bro.
Chose a saved game, on menu screen press Left, Left, Down, Down, Left, Left, Right, Up, Up, Down. You'll hear a bat flutter sound. Then chose to continue your game and you will come to the costume select screen.
Contributed By: ssjgoku72000.