If you still play Valve's excellent first-person puzzle game Portal, you may have noticed a discrete update that has added a mysterious new Steam achievement and some hidden radio transmissions. Could an expansion pack of some kind be on the way?The official update log only features one change: "Changed radio transmission frequency to comply with federal and state spectrum management regulations." Indeed. The new achievement, titled "Transmission Received" is not mentioned in the update log, but it is there. And there's no accompanying description for it, either.
Steam forumgoers have found some new sound files on top of this, of which the filenames feature the word 'dinosaur'. It seems that Valve has deployed quite the cryptic, multi-layered puzzle here.
What could it all mean? Conspiracy theories - as always - in the comments box.