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Original Map: Groxkiller
Background Edition: LilRobot
Wheatley Core: Slade Skox
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Simple to install.
Put the maps, models, and materials folder in the steamname\portal\portal folder.
HOWEVER, IT IS URGENT THAT YOU INSTALL GROXKILLER'S PORTAL 2 LOOKALIKE, OTHERWISE MISSING TEXTURES AWAIT YOU.
Groxkiller's Portal 2 Look-A-Like: http://myaperturelabs.com/file.php?id=510 <-- Not so important any more, the map has been packed. But it is still recommended.
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Included is a No NPC version of the map. It is found inside of the maps folder of the .rar.
Simply drag background1.bsp in that folder to steamname\portal\portal and say Yes if it asks for replacement.
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Thanks, now get ready for Portal 2!