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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.

16 votes
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 …
fire.eagle's user avatar