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2. Portal 2 - Wikipedia

   en.wikipedia.org/wiki/Portal_2

   Portal 2 is a 2011 puzzle platform game developed by Valve for Windows, macOS, Linux, PlayStation 3, and Xbox 360.The digital PC versions are distributed online by Valve's Steam service, while all retail editions are distributed by Electronic Arts.

3. 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.

4. Portal (video game) - Wikipedia

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

   Portal is a 2007 puzzle-platform game developed and published by Valve.It was released in a bundle, The Orange Box, for Windows, Xbox 360 and PlayStation 3, and has been since ported to other systems, including Mac OS X, Linux, Android (via Nvidia Shield), and Nintendo Switch.

5. Portal Reloaded - Wikipedia

   en.wikipedia.org/wiki/Portal_Reloaded

   Portal Reloaded is a 2021 mod for the 2011 puzzle-platform game Portal 2, developed and published by Jannis Brinkmann. As in the official Portal series , gameplay involves solving puzzles by manipulating portals, which allow the player to move through chambers.

6. The Orange Box - Wikipedia

   en.wikipedia.org/wiki/The_Orange_Box

   The Orange Box is a video game compilation containing five games developed and published by Valve.Two of the games included, Half-Life 2 and its first stand-alone expansion, Episode One; had previously been released in 2004 and 2006 as separate products.

7. Source (game engine) - Wikipedia

   en.wikipedia.org/wiki/Source_(game_engine)

   Since the release of Left 4 Dead in late 2008, Valve began releasing "Authoring Tools" for individual games, which constitute the same programs adapted for each game's engine build. After Team Fortress 2 became free-to-play, Source SDK was effectively made open to all Steam users. When some Source games were updated to Source 2013, the older ...