There are two sets of very cunningly hidden images contained within specific audio files in Portal 2. The first set can be located in Chapter 2, Chamber 6 where you can pick up a radio from the junk and take it to the rat mans room for the ‘Final Transmission’ Achievement/Trophy. However… if you record the loud audio noise of the actual transmission and play it back on a special piece of computer software (such as MMSSTV), it can turn the sound file into an image and, wouldn’t you know it? Valve have created the sound file so it displays a particular image (see above). But it doesn’t end there, oh no…
If you make your way to the last chamber of Chapter 3 with the developer commentary option set to ON (this is available upon completion of the main game), instead of finishing the chamber as normal, use a light bridge to access the hidden room in the upper left-hand corner of the room (opposite the security camera). Run up the stairs and into the secret lair. There’s a commentary note that, once activated, plays three separate modem-like sounds. Each one is a different image, detailing the marketing strategies employed by Valve (see above)!
Welcome back to Aperture Science, a world where your Companion Cube isn't you're only company. Take control of Chell once again in Valve's sequel which takes you on an humorous and puzzling adventure and in our detail-packed guide we'll show you:
How to solve every test chamber first time.
Conquer every co-op chamber with a friend.
Loads of High Definition screenshots and videos showing you the solutions to every single chamber.
High Definition strategy videos for every achievement in the game.
Uncover all of the hidden secrets and Easter eggs.