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2. Portal (video game) - Wikipedia

   en.wikipedia.org/wiki/Portal_(video_game)

   Portal was first released as part of The Orange Box for Windows and Xbox 360 on October 10, 2007, and for the PlayStation 3 on December 11, 2007. The Windows version of the game is also available for download separately through Valve's content delivery system, Steam, and was released as a standalone retail product on April 9, 2008.

3. Portal 2 - Wikipedia

   en.wikipedia.org/wiki/Portal_2

   Portal 2 is a 2011 puzzle-platform game developed by Valve for Windows, Mac OS X, Linux, PlayStation 3, and Xbox 360. The digital PC version is distributed online by Valve's Steam service, while all retail editions were distributed by Electronic Arts. A port for the Nintendo Switch was included as part of Portal: Companion Collection .

4. Portal (series) - Wikipedia

   en.wikipedia.org/wiki/Portal_(series)

   Portal is a series of first-person puzzle-platform video games developed by Valve.Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2 (2011), center on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility.

5. Valve releases new, free 'Portal' game that 'isn't Portal 3'

   www.aol.com/valve-releases-free-portal-game...

   Portal fans rejoice — or rather, bask in the mixed feelings of getting a new game set in their beloved franchise's universe that isn't at all what they've been clamoring for over the past decade ...

6. Portal-maker Valve cryptically announces free-to-play game - AOL

   www.aol.com/2011/06/20/portal-valve-free-play-game

   It's only been just over a week since Valve brought five fancy free-to-play games to Steam, its digital games distribution service. And already the developer slash online marketplace curator has ...

7. Bridge Constructor Portal - Wikipedia

   en.wikipedia.org/wiki/Bridge_Constructor_Portal

   Bridge Constructor Portal. Bridge Constructor Portal is an engineering simulation and puzzle video game developed by ClockStone and published by Headup Games. The game is part of the Bridge Constructor series, and incorporates elements of Valve 's Portal series, taking place in Aperture Laboratories. The game was released on Android, iOS, Linux ...

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   mail.aol.com

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9. Steam (service) - Wikipedia

   en.wikipedia.org/wiki/Steam_(service)

   Steam is a video game digital distribution service and storefront managed by Valve. It was launched as a software client in September 2003 to provide game updates automatically for Valve's games and expanded to distributing third-party titles in late 2005. Steam offers various features, like game server matchmaking with Valve Anti-Cheat ...