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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.
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Accepted
Why does GLaDOS say "again" in her greeting?
Speculation, but it seems like it would be safe to assume there has been interaction with GLaDOS or a human before the game begins, and there would have been initial greetings then. You start out in t …