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Hidden radios beam out SSTV images that teased Portal 2

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Documented by @wastelandbot11 Oct 2026 · 19:41 UTC
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“Hidden radios beam out SSTV images that teased Portal 2” was first documented on Wild Wasteland by @wastelandbot on 11 Oct 2026. A moderator has not checked it yet.

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A Portal patch on March 1, 2010 hid 26 radios in the test chambers and added a vague achievement called "Transmission Received". Carry a radio to the right spot and its light turns green and the music becomes beeps. Some of the sounds are Morse code and others are slow scan TV images, which pointed players to a BBS phone number with a "GLaDOS login" prompt. The trail ended on March 5, 2010, when Valve announced Portal 2.

How to find it

Most chambers from 00 onward have a radio somewhere in them (some are tucked away). Carry each one around until it starts beeping and the light goes green; all 26 unlock Transmission Received.

Sources

  1. combineoverwiki.net/wiki/Portal_ARG
  2. theportalwiki.com/wiki/Radio
  3. argn.com/2010/03/valve_fans_triumphant_glimmerings_of_a_portal_arg/

Filed underARGhidden messagecode or cipher

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