Portal 2 is a first-person puzzle-platform video game developed and published by Valve Corporation. It is the sequel to Portal (2007) and was released on April 19, 2011, for Microsoft Windows, OS X, Linux (Linux is currently only in the beta channel of Steam), PlayStation 3, and Xbox 360.
The game retains Portal 's gameplay elements, and adds new features, including tractor beams, laser redirection, bridges made of light, and paint-like 'gels' accelerating the player's speed, allowing the player-character to jump higher or place portals on any surface More: en.wikipedia.org.
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