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"Portal" and its sequel "Portal 2" are puzzle-platform games developed by Valve. Players control Chell, a test subject in the Aperture Science facility, using a portal gun to create linked portals on flat surfaces to solve puzzles and navigate the environment.

The games are known for their innovative gameplay mechanics, dark humor, and the enigmatic AI antagonist, GLaDOS. "Portal 2" expands on the original with more complex puzzles, a deeper story, and cooperative multiplayer mode.

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