Welcome to Portal, a classic 2007 puzzle-platform game by Valve. Set in the Aperture Science facility, Portal is about a young woman, Chell, undertaking a series of tests with a portal device, a tool used to create wormhole-like connections between two flat surfaces. GLaDOS, a venomous AI, controls the facility and makes life hard for Chell.

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portal, walkthrough, part 1, test chamber 0, level 0, challenge, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, escape, glados, boss fight, final, valve, portals, chell, aperture science facility

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