In Batman: Arkham City, you can use the Cryptographic Sequencer to decode various broadcasts.
At the approximate position of 637 on the x-axis, and 472 on the y-axis is a person reading off a series of numbers, similar to a number station. When you try to decode the broadcast on the sequencer, it doesn't do anything.
Has anyone discovered what these numbers mean? The number sequence is (hopefully I wrote it down right):
9-23-9-12-12-18-5-20-21-18-14-2-1-20-13-1-14
Best Answer
It's a substitution cipher. a = 1, b = 2, etc.
or
I just listened to it, and the voice is familiar, put I can't put it to a character (not the Riddler, he wants you to know the puzzle is his).