This map pack for Portal is currently under development and testing, and is slated for release in 2009.
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There's a thread for this project on Interlopers.net! You can find that here, and major news and discussions will occur there.
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This map pack picks off at a mid-point during the testing, continuing on with an alternate story, twists, and of course puzzles. It sports an entirely custom set of dialog by GLaDOS. No more recycled clips from Portal!
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Unfortunatly, I'm the only person working on this project, making all sounds, textures, and both designing and building the levels. Progress, unfortunately, is slow.
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Please see the News section for more information.