Hidden Cryptographic Sequencer Message
If you use the cryptographic sequencer and tune in anywhere in the general range of 700.00/500.00, you will hear a disembodied voice repeating a sequence of numbers over and over. Every time the sequence ends a tone chimes, and then the number sequence starts over again. The numbers are 9 23 9 12 12 18 5 20 21 18 14 2 1 20 13 1 14. If you assign a letter to each number (A=1 B=2 C=3 etc.), the message translates to "I WILL RETURN BATMAN."
On station 500.00/900.00 you get a different numeric string:
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 *music chime* repeats. This can be decoded as "YOU WILL PAY FOR WHAT YOU HAVE DONE TO ME."
Alternate Ending
In order to unlock the alternate ending, you must have the Catwoman DLC. In her third mission when you have the option to go left or right with the "loot," head right for the alternate ending. Don't worry; you'll be able to "rewind" back and not ruin anything in the main game.
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Skins and Outfits
There are alternate Skins in Arkham City, allowing players to change the looks of Batman and Robin.
1970s Batman
* AU: Preorder at EB Games
* UK: Preorder at ShopTo
* US: Preorder at Toys 'R' Us
Animated Series
* AU: Preorder at JB HiFi
* NZ: Preorder at MightyApe
Batman Beyond
* AU: Preorder at Game
* UK: Preorder at GameStop
* NZ: Preorder at MightyApe
The Dark Knight Returns
* Comes with the Collector's Edition of Arkham City
Earth One
* AU: Preorder at JB HiFi
* NZ: Preorder at MightyApe
Sinestro Corps Skin (PS3 Exclusive)
* Buy a Copy of Green Lantern on Blu-ray from Best Buy.
Red Robin
* UK: Preorder at GAME OR gamestation,
* US: Preorder at Best Buy
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Reference to Batman: Arkham City in Arkham Asylum
In the Warden's Office, head back to the room with the Warden's portrait on the far wall. Turn left as soon as you enter the doorway and approach the wooden wall. You can destroy this with Explosive Gel. It may take a bit of trial and error, but one panel can be blown away. Beyond this is an unmarked room with a blueprint on the wall. It shows plans for the relocation or expansion of Arkham to Gotham City.
This is a nod to the setting of Batman: Arkham City. For video and images of this Easter Egg, check out IGN's article, Warden Sharp's Plans For Arkham City. Batman Arkham City Cheazts , for other cheazts ....
