**Portal is a critically acclaimed first-person puzzle game developed by Valve and released in 2007. The player takes control of Chell, a test subject who wakes up in a mysterious facility controlled by an artificial intelligence (AI) named GLaDOS. GLaDOS guides Chell through a series of test chambers, which she must complete in order to progress. The only tool Chell has at her disposal is the Aperture Science Handheld Portal Device, which allows her to create two portals between any two flat surfaces.
Chell must use the portal gun to solve puzzles, navigate the test chambers, and avoid obstacles. The puzzles become increasingly complex as the game progresses, and Chell must use all of her ingenuity to escape the facility. Portal is praised for its innovative gameplay, unique sense of humor, and compelling story. It is considered to be one of the greatest video games of all time.**
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