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• Big head mode

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

• Easy "Story Teller" achievement

Play offline (not logged into Xbox Live or PlayStation Network as your system date is automatically set via the internet). Set the date of your console to one of the following dates: January 1st, Feburary 14th, March 17th, April 1st, May 8th, June 19th, July 4th, August 16th, September 5th, October 31st, November 24th, December 25th. Then, load a saved game file where the story progress is past rescuing Catwoman. Enter the courthouse and talk to Calendar Man in the basement. He will tell you a story about the current month's holiday and tell you to return for the next month. Save the game by leaving the building. Exit to the system settings, then manually change the date to the next holiday. Repeat the process until you have cycled through the entire calendar year. The calendar on the wall next to his cell will highlight the holiday dates for the current year and scribble out which months you have already spoken to Calendar Man about.

• Harley Quinn pregnancy

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.

• Hidden messages

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".

• Lost reference

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.

• New Game Plus mode

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.

• Various Achievements

Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
I'm Batman ( 10 points )	Become the Bat.
Acid Bath ( 10 points )	Save the damsel, but is she in distress?.
Savior ( 10 points )	Save the medical volunteers.
Chimney Sweep ( 10 points )	There is only one way in.
One Armed Bandit ( 10 points )	Hammer the point home.
Communication Breakdown ( 10 points )	Clear the airwaves.
Gladiator ( 10 points )	Last man standing.
Wrecking Ball ( 25 points )	Stop the unstoppable.
Lost And Found ( 10 points )	Uncover the secret of Arkham City.
Sand Storm ( 25 points )	We are legion.
Hide And Seek ( 25 points )	A deadly game of hide and seek.
Ghost Train ( 25 points )	Fight for survival.
Freefall ( 25 points )	Don't look down.
Exit Stage Right ( 50 points )	All the world is a stage.
Forensic Expert ( 10 points )	Collect enough evidence to locate the gun for hire.
Contract Terminated ( 25 points )	Stop the contract operative.
Serial Killer ( 25 points )	Track down the serial killer.
Mystery Stalker ( 15 points )	Reveal the mystery watcher.
Distress Flare ( 5 points )	Answer the call for help.
Broken Toys ( 25 points )	Destroy it all.
Ring Ring ( 5 points )	Answer a ringing phone.
Dial Z For Murder ( 25 points )	Stop the phone booth killer.
Stop the Clock ( 15 points )	Time is running out.
Bargaining Chip ( 15 points )	Reunite the separated couple.
AR Knight ( 25 points )	Complete all augmented reality training exercises.
Fully Loaded ( 10 points )	Collect all of Batman's gadgets and upgrades.
Aggravated Assault ( 10 points )	Stop all assaults in Arkham City.
IQ Test ( 10 points )	Solve the first riddle.
Conundrum ( 20 points )	Rescue the first hostage from Riddler.
Mastermind ( 20 points )	Rescue the second hostage from Riddler.
Puzzler ( 30 points )	Rescue the third hostage from Riddler.
Intellectual ( 30 points )	Rescue the fourth hostage from Riddler.
Brainteaser ( 40 points )	Rescue the fifth hostage from Riddler.
Genius ( 50 points )	Rescue all the hostages from Riddler.
Bronze Revenge ( 10 points )	Obtain 24 medals on the original Arkham City ranked maps ( as Batman).
Silver Revenge ( 20 points )	Obtain 48 medals on the original Arkham City ranked maps ( as Batman).
Gold Revenge ( 40 points )	Obtain all 72 medals on the original Arkham City ranked maps ( as Batman).
Campaign Bronze ( 10 points )	Obtain 24 medals on the original Arkham City ranked maps ( as Batman).
Campaign Silver ( 20 points )	Obtain 72 medals on the original Arkham City campaigns ( as Batman).
Campaign Gold ( 40 points )	Obtain all 108 medals on the original Arkham City campaigns ( as Batman).
Flawless Freeflow Fighter 2.0 ( 5 points )	Complete one combat challenge without taking damage ( any character).
Twice Nightly ( 75 points )	Complete New Game Plus.
Gotham Base Jumper ( 5 points )	Jump off the tallest building in Arkham City and glide for 1 minute without touching the ground.
Pay Your Respects ( 5 points )	A moment of remembrance.
Story Teller ( 10 points )	Have 12 murderous dates with Calendar Man.
Catch ( 5 points )	Find someone to play remote Batarang catch with.
50x Combo ( 5 points )	Complete a combo of 50 moves ( any play mode, any character).
Perfect Freeflow 2.0 ( 5 points )	Perform a perfect combo including all of Batman's combat moves ( any play mode).
Gadget Attack ( 5 points )	Use 5 different Quickfire gadgets in one fight ( any play mode).
Perfect Knight - Day 2 ( 75 points )	Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddlers Revenge ( as Batman).

• More Cheat Codes for Batman: Arkham City!

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