Portal: Prelude
Portal: Prelude is an unofficial prequel to Portal, leading up to the creation of GlaDOS with 8 chapters and 48 challenges. It’s set to be released later this month; until then, sing a song.

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Portal: Prelude is an unofficial prequel to Portal, leading up to the creation of GlaDOS with 8 chapters and 48 challenges. It’s set to be released later this month; until then, sing a song.
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