Using the Cryptographic Sequencer throughout the game, you can find three hidden radio waves that transmit numbers.
Submitted By: Eve
These series of number can be deciphered with different methods. You will get a series of numbers, which need to be deciphered by correlating the numbers to letters of the alphabet.
These codes read out "I Will Return Batman", "You Will Pay For What You Have Done To Me", and "Fear Will Tear Gotham City To Shreds". The methods used to obtain these results, and their context, suggests that Scarecrow is planned to make a return.
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