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Portal 2 is a 2011 puzzle-platform video 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 .

Walkthroughs may be considered guides on helping to enhance the experience of players, to assist towards unlocking game achievements or simply as a means to socialise with like-minded individuals as a distraction from everyday life. Walkthroughs originated as text-based descriptive instructions in magazines for playing through a video game.

Half-Life is a 1998 first-person shooter (FPS) game developed by Valve and published by Sierra Studios for Windows. It was Valve's debut product and the first game in the Half-Life series. Players assume the role of Gordon Freeman, a scientist who must escape the Black Mesa Research Facility after it is invaded by aliens.

Online console gaming involves connecting a console to a network over the Internet for services. Through this connection, it provides users the ability to play games with other users online, in addition to other online services.