For questions about Portal, a single-player puzzle-platform video game published in 2007 by Valve. The player solves Test Chamber puzzles using a Handheld Portal Device to create a pair of portals that objects can pass through.

Portal is a highly acclaimed single-player puzzle-platform video game published in 2007. The player solves Test Chamber puzzles using a Handheld Portal Device to create a pair of portals that objects can pass through.

The game is notable for its creative interface and dark humor.

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