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https://www.youtube.com/watch?v=6Hpr2uQ1NFI
https://www.youtube.com/watch?v=X8FxjSD2VNA
https://www.youtube.com/watch?v=sAGlOUHkRsE
https://www.youtube.com/watch?v=c7vC2bjvQbw
https://www.youtube.com/watch?v=aP1Y6irvpBI
https://www.youtube.com/watch?v=HGmfuYPskhM
https://www.youtube.com/watch?v=e1r6qDbLjbI
https://www.youtube.com/watch?v=ita4kFrS7KQ
https://www.thonky.com/portal-2-walkthrough/chapter-4-chamber-21
https://en.wikipedia.org/wiki/Portal_2
https://store.steampowered.com/news/?feed=portal2_blog
https://half-life.fandom.com/wiki/GLaDOS%27_testing_track_(Portal_2)
https://steamdb.info/app/620/
http://www.thinkwithportals.com/blog.php
https://gaming.stackexchange.com/questions/24046/what-happens-if-you-c...
https://www.giantbomb.com/portal-2/3030-21662/
https://combineoverwiki.net/wiki/GLaDOS%27_testing_track_(Portal_2)
https://combineoverwiki.net/wiki/Portal_2
Co-Authored By:
2020-10-24