After the discovery of the four rooms it was widely agreed that the music within each room would contain some hidden information. During the Trials Evolution riddle, Antti used audio to hide some Morse Code. To hide it in the audio he used a technique called Audio Steganography where an image can be hidden inside an audio waveform. Using spectrum analysis tools we were unable to find anything of interest in the audio from the colored rooms and decided the hidden information was disguised using a different technique.
Many riddlers spent time researching methods of hiding information in audio and we went down some pretty interesting roads until we came up with the answer! It turns out that Antti has hidden a code within the music from each room, let me explain…
Each room contains a musical melody consisting of 4 piano notes played over a chord, it is the notes that are important.
By listening to and recording each note from each room it was found that each musical piece contained the 4 same notes in different patterns, the notes being C, D, E and G.
The blue room’s notes – GCDE
The green room’s notes – GCEG
The yellow room’s notes – CEDG
The red room’s notes – EGDC
All together in the order that the flames appear on Temple of Trials – GCDEGCEGCEDGEGDC
We looked at this set of notes and immediately recognized a code that could easily be translated to directional inputs on the controller. By brute force it was found that C = right, D = down, E = left and G = up. Putting this all together we get the code: URDLURLURLDULUDR
Our immediate thought was to enter this code in the Temple of Trials room… We were right!