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https://www.forbes.com/sites/davidewalt/2011/04/19/what-is-portal-2-an...
https://steamcommunity.com/app/620/discussions/0/828925849177385748/
https://steamcommunity.com/app/620/discussions/0/846957263114511986/
https://www.digitaltrends.com/apple/portal-2-now-available-for-pc-xbox...
http://www.thinkwithportals.com/
http://blog.360i.com/social-marketing/portal-2-arg-launch-offers-great...
http://www.escapistmagazine.com/news/view/109382-Teacher-Cancels-Class...
https://www.reddit.com/r/Steam/comments/28mrf8/help_portal_2_wont_laun...
https://github.com/ValveSoftware/portal2/issues/275
http://rjwattenhofer.com/articles/gaming/portal-2-co-op-gameplay-setup...
https://support.steampowered.com/kb_article.php?ref=1040-JWMT-2947
https://www.gameinformer.com/b/news/archive/2011/04/14/is-portal-2-lau...
https://www.trueachievements.com/a149555/pturretdactyl-achievement
https://pcgamingwiki.com/wiki/Portal_2
https://www.gamesradar.com/valve-celebrates-free-portal-2-peer-review-...
Co-Authored By:
2020-11-27