You cannot tune into this broadcast right away. The game requires specific progression through the main story campaign.
In , the "2-7-5, 3-2-5" radio frequency triggers the "Enigma Conundrum" side mission , a critical gameplay sequence where Batman must decode the Riddler's broadcasts using the Cryptographic Sequencer to save innocent hostages.
After disabling Riddler’s jamming signal, Batman can tune into various encrypted radio frequencies. One broadcast plays a robotic voice repeating:
The frequency is handed to you directly by the first hostage you rescue during the "Enigma Conundrum" side mission. Location: The Solomon Wayne Courthouse .
Rotate the physical dials on the extracted Enigma Machine to accurately align the letters and spell out the six-letter solution: .