Lobbies · prototype · v0.1 · made for gamers

Released October 10, 2007 · Valve
Waking up in a seemingly empty laboratory, the player is made to complete various physics-based puzzle challenges through numerous test chambers in order to test out the new Aperture Science Handheld Portal Device, without an explanation as to how, why or by whom.
IGDB
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The Portal Lobby
Half-Life 2 and Portal now on Nvidia Shield
Nvidia is aiming to sell Project Shield to gamers with two highly-regarded classics. Half-Life 2 and Portal are now available natively on the device. In a short promotional video, Nvidia announced the pair of games and says it worked with Valve to bring them to Shield.
Linux beta builds of Portal, Left 4 Dead 2 now available on Steam
Valve has offered a treat to Linux users with the release of a Left 4 Dead 2 beta. A Portal beta for Linux is also available, but Valve has been a bit mum on that release. If you own any of those three games, the betas should appear in your Steam library. The Left 4 Dead blog announced the release,…
Shack PSA: Free Portal on Steam
Only a terrible person will not have played Portal by now, and you're surely not a terrible person, but should you happen to know any dreadful people, you can help them remedy that by pointing out that Valve's splendid first-person puzzler is free on Steam for the next few days.
via Steam