According to audio logs found in the , Hugo Strange designed these broadcasts using a variant of the Caesar Shift Cipher applied to musical note frequencies. Strange was obsessed with the number 5 (representing the five stages of grief, which he believed Arkham inmates needed to be forced through). The numbers 2-7-5 and 3-2-5 correspond to the notes D4 and E4 on a piano, which in turn spell "D.E.A.D." when translated using Strange’s personal cipher key (found in his office).

To hear the broadcast, you must tune your to the following coordinates: X: 700.00 / Y: 500.00

This will simply reset the terminal. The game expects two separate three-digit codes.

Fans have debated whether the numbers reference a real-life event. Some speculate that 275 and 325 are the old police band frequencies for Gotham’s 7th and 12th precincts. Others believe it is a nod to the comic Batman #275 and Detective Comics #325 . Rocksteady has never officially confirmed.

Successfully aligning this solution directly updates your map UI with the hidden location coordinates of the next kidnapped hostage.

If you’ve been prowling the rain-slicked rooftops of North Gotham, you’ve likely encountered one of the most persistent nuisances in the city: The Riddler

: Once tuned correctly, the Riddler will broadcast a riddle that you must solve using the Enigma Machine