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https://www.rockpapershotgun.com/2012/03/08/the-portal-2-that-could-ha...
https://developer.valvesoftware.com/wiki/Behind_the_Scenes_(Portal_2)
https://en.wikipedia.org/wiki/Portal_2
http://myweb.fsu.edu/vshute/pdf/portal1.pdf
https://arstechnica.com/gaming/2011/05/portal-2-a-good-game-but-not-a-...
https://www.pinterest.com/masterhasteiii/portal-2-project-moodboard/
https://www.pinterest.com/pin/364228688583135650/
https://www.artstation.com/artwork/vEwY6
https://www.fastcompany.com/1750003/portal-2s-creators-crafting-games-...
https://www.ign.com/articles/2011/03/02/portal-2-valves-storytelling-s...
https://www.gamasutra.com/view/feature/134512/synthesizing_portal_2.ph...
https://medium.com/@mhkt/portal-2-taught-me-everything-i-know-about-on...
https://www.theguardian.com/technology/gamesblog/2011/apr/19/portal-2-...
https://steamcommunity.com/app/620/discussions/0/846963165425722295/?l...
https://www.parkablogs.com/picture/art-of-portal-2-cancelled-not-forgo...
https://www.gamesradar.com/portal-2-the-10-things-you-need-to-know/
https://learningworksforkids.com/playbooks/portal-2/
Co-Authored By:
2020-11-28