. After completing enough Riddler challenges and rescuing the first medical team hostage (Eddie Burlow) at the courthouse, the hostage gives Batman these specific numbers. 1. Tune the Cryptographic Sequencer

To intercept this specific frequency, you must advance through the main campaign until you are prompted to investigate the Solomon Wayne Courthouse.

The numbers you hear are not random; they are a puzzle. While the game provides several ciphers for different broadcasts, the significance of the "2-7-5 3-2-5" code is found by matching each number to its corresponding letter in the alphabet, with A=1, B=2, and so on.

: You do not need to be pixel-perfect; once you are close to these numbers, the signal strength will increase, and you will hear the Riddler’s voice Confirm the Signal

Solving the 2-7-5 / 3-2-5 puzzle is only the first step. To rescue the remaining medical team, you must satisfy a strict requirement of collected Riddler trophies, riddles, and breakable objects scattered across the super-prison.