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Portal is a puzzle- platform video game developed and published by Valve Corporation. It was released in a bundle package called The Orange Box for Microsoft Windows, Xbox 360 and PlayStation 3 in 2007. The game has since been ported to other systems, including OS X, Linux, and Android.
Portal (video game) - Wikipedia 
Added 6 months ago by Josh Shi
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Portal (video game) - Wikipedia 
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Portal is a puzzle- platform video game developed and published by Valve Corporation. It was released in a bundle package called The Orange Box for Microsoft Windows, Xbox 360 and PlayStation 3 in 2007. The game has since been ported to other systems, including OS X, Linux, and Android.
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