Transmission Received

The Portal 2 ARG collectible. Scattered through the test chambers are 26 hidden radios; carry each one to a specific spot in its room and the static resolves into a signal (its light turns green) - the transmissions are Morse code and images teasing Portal 2. You need all 26 lit. Finding the exact sweet-spot in each room is fiddly, so follow a radio-location walkthrough and work through the chambers via chapter select after you've finished the story. Nothing here is time-limited, so its always doable - optional.