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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. Portal:Video games - Wikipedia

   en.wikipedia.org/wiki/Portal:Video_games

   A video game or computer game is an electronic game that involves interaction with a user interface or input device (such as a joystick, controller, keyboard, or motion sensing device) to generate visual feedback from a display device, most commonly shown in a video format on a television set, computer monitor, flat-panel display or touchscreen on handheld devices, or a virtual reality headset.

6. Portal Reloaded - Wikipedia

   en.wikipedia.org/wiki/Portal_Reloaded

   Genre (s) Puzzle-platform. Mode (s) Single-player, multiplayer. Portal Reloaded is a 2021 free modification for Portal 2, created by German developer Jannis Brinkmann. As in the official Portal games, gameplay involves solving puzzles by manipulating portals which allow the player to move through space. Additionally, the mod allows players to ...

7. List of open-source video games - Wikipedia

   en.wikipedia.org/.../List_of_open-source_video_games

   The video game remakes in this table were developed under an open-source license which allows usually the reuse, modification and commercial redistribution of the code. The required game content (artwork, data, etc.) is taken from a proprietary and non-opened commercial game, so that the whole game is non-free. See also the Game engine ...