Batman: Arkham City

Codes

• Big Head Mode

  Take out your cryptographic sequencer and hold L1 and R1. Rotate the left analog counterclockwise and at the same time rotate the right analog clockwise. Do this until Batmans head becomes big. All enemies will have a big head as well.
  

Unlockables

• New Game+

  New Game+ allows you to play through the story again on a harder difficulty with all of the tools you already acquired in your first game. Note that this will not prevent you from playing your original save as well -- the New Game+ is separate.
  

  Unlockable	How to Unlock
  New Game+	Beat the story mode on Normal or Hard difficulty.

Easter Eggs

• Cryptographic Message *SPOILERS*

  Using the cryptographic Sequencer, set the coordinates to 200, 500. A voice will speak the following 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. To decode requires a bit of work. First set each number to a letter in the alphabet but in reverse so that Z=1, Y=2, X=3 and so on. From there you use a special cipher known as a Vigenere Cipher that requires a keyword to translate. By using the keyword "scarecrow", the message is translated to "FEAR WILL TEAR GOTHAM CITY TO SHREDS". Due to the keyword being scarecrow, it could be implied that Scarecrow is behind at least this message and possibly more.
  

• Hidden Message

  Use Batman's Cryptographic Sequencer and track down the XY coordinates 700, 490. You'll intercept a radio frequency that reads the following numbers: 9-23-9-12-12-18-5-20-21-18-14-2-1-20-13-1-14 (it will then make a buzz sound and repeat these numbers) When matched to the corresponding letters of the alphabet they spell out I WILL RETURN BATMAN.
  

• Hidden Message *Spoiler*

  Using the Cryptographic Sequencer, locate coordinates 500,900. You will intercept a frequency repeating the number sequence "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". To decode, 1 = C, 2 = B, 3 = A, 4 = Z, and so on. Decoded, the message reads "YOU WILL PAY FOR WHAT YOU HAVE DONE TO ME".

• Scarecrow Hideout

  Go on top of a boat near the industrial district (the boat should be near two cranes). While on the boat, take out the cryptographic sequencer and use it. Letters will appear instead of the radio stations. Turn the letters until it reads "City Of Terror." A secret passage on the boat will open. Go down into the boat to find hundreds of roaches, a medical order form addressed to Jonathan Crane, and a Scarecrow victim who will squirm if you zoom in on him.
  

Trophies

• Catwoman DLC Trophies

  Trophy	Description
  Arkham City Sirens (Silver)	Drop in on an old friend
  Campaign Kitty (Bronze)	Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)
  Family Jewels (Silver)	Retrieve your stolen goods
  Feline Revenge (Bronze)	Obtain all 72 medals on the original Arkham City ranked maps (as Catwoman)
  Pick Pocket (Silver)	Steal the score of a lifetime
  Sphinx' Riddle (Bronze)	Complete all 40 of the Catwoman Riddler grid items

• Nightwing DLC Trophies

  Trophy	Description
  Campaign Nightwing (Bronze)	Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing)
  Nightwing Revenge (Bronze)	Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)

  
  

• Robin DLC Trophies

  Trophy	Description
  Campaign Wonder (Bronze)	Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)
  Robin Revenge (Bronze)	Obtain 78 medals on the original Arkham City and Robin Bundle Pack ranked maps (as Robin)

• Trophies

  Trophy	Description
  50x Combon (Bronze)	Complete a combo of 50 moves (any play mode, any character)
  Acid Bath (Bronze)	Save the damsel, but is she in distress?
  Aggravated Assault (Bronze)	Stop all assaults in Arkham City
  AR Knight (Silver)	Complete all augmented reality training exercises
  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
  Intellectual (Bronze)	Rescue the fourth hostage from Riddler
  IQ Test (Bronze)	Solve the first riddle
  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