Big head mode...
	Easy Augmented Reality Challen...
	Harley Quinn pregnancy...
	Hidden messages...
	Lost reference...
	New Game Plus mode...
	Select any unlocked skin...
	Taunting...
	Various Trophies...

Hold L1 + R1 and rotate the Right Analog-stick clockwise ten times. Repeat the code to disable its effect.

One of the last four Augmented Reality Challenges appears to be difficult because you are supposed to execute a U-turn during your dive bomb. This can be done easier by using the grapple boost going past the first checkpoint, then turning around while gliding. You can then glide through all the checkpoints much easier.

Go to the manager's office inside the Steel Mill. On the floor, next to the Harley Quinn costume, there is a positive pregnancy test.

Find the coordinates X700.00, Y490.00 on the Cryptographic Sequencer to intercept a radio frequency that contains the following repeating numbers: 9, 23, 9, 12, 12, 18, 5, 20, 21, 18, 14, 2, 1, 20, 13, 1, 14. The message is decoded as "I WILL RETURN BATMAN".

Find the coordinates X500.00, Y900.00 on the Cryptographic Sequencer to intercept a radio frequency that contains the following repeating numbers: 5, 15, 9, 7, 21, 18, 18, 14, 3, 5, 24, 15, 12, 7, 22, 3, 10, 5, 15, 9, 22, 3, 8, 25, 26, 15, 16, 25, 10, 15, 17, 25. The message is decoded as "YOU WILL PAY FOR WHAT YOU HAVE DONE TO ME".

The last radio transmission contains the numbers: 3, 20, 26, 18, 26, 16, 24, 1, 11, 4, 24, 9, 3, 8, 5, 2, 12, 18, 6, 16, 7, 11, 3, 10, 17, 5, 13, 4, 21, 8. The message is decoded as "FEAR WILL TEAR GOTHAM CITY TO SHREDS".

Play the mission where you have to get the cure back from Joker. There is a part where a video plays featuring the Joker ranting about the ending to the show Lost.

Successfully complete the game under the Normal or Hard difficulty setting. This mode allows you to keep your previously earned gadgets and experience points. Also, there will not be any counter icons on thugs, thugs will be more difficult from the start, thugs will have different configurations, and Bosses will be tougher.

Select a saved game file. Then, press Left(2), Down(2), Left(2), Right, Up(2), Down at the main menu. A sound will confirm correct code entry. Continue your game, and all unlocked skins will be available for selection in Story mode without first completing the game.

Rotate the Right Analog-stick clockwise repeatedly. Note: If you execute a taunt before performing a glide kick as Batman or Robin, the view will change to the enemy's perspective.

Complete the following tasks to unlock PlayStation 3 trophy rewards.

Trophy	How to unlock
50x Combo (Bronze)	Complete a combo of 50 moves (any play mode, any character).
AR Knight (Silver)	Complete all augmented reality training exercises.
Acid Bath (Bronze)	Save the damsel, but is she in distress?
Aggravated Assault (Bronze)	Stop all assaults in Arkham City.
Bargaining Chip (Bronze)	Reunite the separated couple.
Brainteaser (Silver)	Rescue the fifth hostage from Riddler.
Broken Toys (Silver)	Destroy it all.
Bronze Revenge (Bronze)	Obtain 24 medals on the original Arkham City ranked maps (as Batman).
Campaign Bronze (Bronze)	Obtain 36 medals on the original Arkham City campaigns (as Batman).
Campaign Gold (Silver)	Obtain all 108 medals on the original Arkham City campaigns (as Batman).
Campaign Silver (Bronze)	Obtain 72 medals on the original Arkham City campaigns (as Batman).
Catch (Bronze)	Find someone to play remote Batarang catch with.
Chimney Sweep (Bronze)	There is only one way in.
Communication Breakdown (Bronze)	Clear the airwaves.
Contract Terminated (Silver)	Stop the contract operative.
Conundrum (Bronze)	Rescue the first hostage from Riddler.
Dial Z For Murder (Silver)	Stop the phone booth killer.
Distress Flare (Bronze)	Answer the call for help.
Exit Stage Right (Silver)	All the world is a stage.
Flawless Freeflow Fighter 2.0 (Bronze)	Complete one combat challenge without taking damage (any character).
Forensic Expert (Bronze)	Collect enough evidence to locate the gun for hire.
Freefall (Bronze)	Don't look down.
Fully Loaded (Bronze)	Collect all of Batman's gadgets and upgrades.
Gadget Attack (Bronze)	Use 5 different Quickfire gadgets in one fight (any play mode).
Genius (Silver)	Rescue all the hostages from Riddler.
Ghost Train (Silver)	Fight for survival.
Gladiator (Bronze)	Last man standing.
Gold Revenge (Silver)	Obtain all 72 medals on the original Arkham City ranked maps (as Batman).
Gotham Base Jumper (Bronze)	Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground..
Hide And Seek (Silver)	A deadly game of hide and seek.
I'm Batman (Bronze)	Become the Bat.
IQ Test (Bronze)	Solve the first riddle.
Intellectual (Bronze)	Rescue the fourth hostage from Riddler.
Lost And Found (Bronze)	Uncover the secret of Arkham City.
Mastermind (Bronze)	Rescue the second hostage from Riddler.
Mystery Stalker (Bronze)	Reveal the mystery watcher.
One-Armed Bandit (Bronze)	Hammer the point home.
Pay Your Respects (Bronze)	A moment of remembrance.
Perfect Freeflow 2.0 (Bronze)	Perform a perfect combo including all of Batman's combat moves (any play mode).
Perfect Knight - Day 2 (Gold)	Complete every challenge in Arkham City - Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddlers Revenge (as Batman).
Platinum (Platinum)	Congratulations.
Puzzler (Bronze)	Rescue the third hostage from Riddler.
Ring Ring (Bronze)	Answer a ringing phone.
Sandstorm (Silver)	We are legion.
Savior (Bronze)	Save the medical volunteers.
Serial Killer (Silver)	Track down the serial killer.
Silver Revenge (Bronze)	Obtain 48 medals on the original Arkham City ranked maps (as Batman).
Stop the Clock (Bronze)	Time is running out.
Storyteller (Bronze)	Have 12 murderous dates with Calendar Man.
Twice Nightly (Silver)	Complete New Game Plus.
Wrecking Ball (Silver)	Stop the unstoppable.