New Game Plus mode:
Complete the game under the Normal or Hard difficulty setting. This mode allows you to keep your previously obtained gadgets and experience points. Also, there will not be any counter icons on thugs, thugs will be tougher from the start, thugs will have different configurations, and Bosses will be stronger.
Hidden messages:
-Use Batman’s Cryptographic Sequencer and track down the XY coordinates 700, 490. You’ll intercept a radio frequency that reads these numbers: 9-23-9-12-12-18-5-20-21-18-14-2-1-20-13-1-14 (there will be a buzz sound and repeat these numbers) When matched to the corresponding letters of the alphabet they spell out I WILL RETURN BATMAN.
-Locate 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. When decoded, the message reads “YOU WILL PAY FOR WHAT YOU HAVE DONE TO ME”.
-Using the cryptographic Sequencer, set the coordinates to 200, 500. A voice will speak these 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 good amount 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 translates to “FEAR WILL TEAR GOTHAM CITY TO SHREDS”. Since the keyword is scarecrow, it is likely that Scarecrow is behind this message and possibly more.
“Story Teller” achievement hint:
Note: Perform this while 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 a holiday date (for example, January 1, February 14, etc.) and load a saved game file where the story progress is past rescuing Catwoman. Enter the courthouse and speak 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 following 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.
Riddler Trophies:
Search the following locations to find the corresponding trophies:
Park Row
1. East of ACE Chemicals is a gargoyle sprayed with Riddler question marks. Climb onto here and drop down to the concealed area below for the trophy.
2. East of Trophy 1 on the roof near a wall with five Riddler question marks on the wall. Use the Batarang to destroy the right-hand Riddler mark by waiting until the light is on.
3. On the building north of ACE Chemicals, behind a ventilation system. Use the remote controlled Batarang to destroy the Riddler mark.
4. On the roof of the building with Park Row written over it on the map. The timed panel is a few steps to the west.
5. On top of the most northwestern building near Solomon Wayne Courthouse. Use detective vision to locate all four Riddler marks. You have 4 seconds to destroy all four marks, so use the explosive gel on the 3 hidden marks, then use the Batarang on the final Riddler mark closest to the trophy