Batman: Arkham City

Complete the following achievements to unlock Xbox Live Gamerscore points.

At the main menu, press Left(2), Down(2), Left(2), Right, Up(2), Down to unlock an option to select any of the bonus costumes. If you entered the code correctly, you will hear a sound when you continue your game.

The alternate ending requires the bonus "Catwoman" downloadable content. In Catwoman's third mission, when you have the option to go left or right with the "loot", go right to view the alternate ending. You will still be able to go backwards and not ruin anything in the main campaign.

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

If you open up your Cryptographic Sequencer, you can find three broadcasts from a slightly fuzzy and robotic voice saying seemingly random numbers. These numbers are actually a cipher, numeric representations of the alphabet. Two of the broadcasts are garbage, but the third one says: "9 23 9 12 12 18 5 20 21 18 14 2 1 20 13 1 14" which translates to " I WILL RETURN BATMAN".

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.

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.

Complete the following achievements to unlock Xbox Live Gamerscore points.

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".

After you defeat Ra's al Ghul and are leaving the subway tunnels, instead of going the correct way, backtrack until you find a gate blocking your path. You should see a button on the far wall and a gap in the iron bars. Throw the Batarang through the gap to hit the button. There will be a cutscene with Killer Croc. Note: You cannot reach this area again after this point in the game.