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10/10/2007 'Portal' is released

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Official Portal Trailer

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Portal Developer Walkthrough E3 2007

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Classic Game Room - PORTAL review for PC

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[Portal Beta] Early 2007 GLaDOS Fight

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Let's Play Portal - Part 1 (Gameplay & Commentary)

Portal is a puzzle-platform video game developed and published by Valve Corporation. Portal consists primarily of a series of puzzles that must be solved by teleporting the player's character and simple objects using "the Aperture Science Handheld Portal Device", a device that can create inter-spatial portals between two flat planes.