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2. Portal (video game) - Wikipedia

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

   Single-player. 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 . Portal consists primarily of a series of puzzles ...

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 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 .

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 (1986 video game) - Wikipedia

   en.wikipedia.org/wiki/Portal_(1986_video_game)

   Portal is a text-driven adventure with a graphical interface published for the Amiga in 1986 by Activision. [citation needed] The writing is by American author Rob Swigart, and it was produced by Brad Fregger. Ports to the Commodore 64, Apple II, and IBM PC were later released. [citation needed] A version for the Atari ST was announced and ...

7. Mari0 - Wikipedia

   en.wikipedia.org/wiki/Mari0

   Single-player, multiplayer. Mari0 (pronounced "mari-zero" or "mari-oh") is a 2012 side-scrolling platform video game developed by German [1] indie developer Maurice Guégan with creative input from Sašo Smolej and released onto their website Stabyourself.net. It combines gameplay elements from Nintendo 's Super Mario series and Valve 's Portal ...