Batman: Arkham City - Armored Edition

With the Catwoman bundle-pack installed, return to Poison Ivy's Hotel in Amusement Mile after completing Story mode to find additional dialogue between the two characters.

In various locations within Arkham City are large smiling cat-faced spheres. This is the logo used by Max Shrek for his department store in the movie Batman Returns.

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.

Hold ZL + ZR and rotate the Left Analog-stick clockwise and the Right Analog-stick counterclockwise in the Cryptographic Sequencer.

Find Calendar Man locked up under the Courthouse in the Arkham City prison zone, where you fought Two-Face. He will normally say something unique if the system date is set to a holiday. However, there is a special unique date that will trigger a hidden message. Set the system date to December 13, 2004 and he will say the following:

"Well, well, well. And on today of all days."

"Do you remember my early work? Flawed but it showed promise. Just like you. As your skills improved, I perfected mine."

"Starting with seasons, and moving through the weeks, I became stronger. My work more elaborate. Days were the secret, Batman. And the end of days is coming."

"I was there at your beginning, and I will be there at your end."