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https://steamcommunity.com/sharedfiles/filedetails/?id=234558809
https://en.wikipedia.org/wiki/Source_(game_engine)
https://theportalwiki.com/wiki/Portal_2
https://gaming.stackexchange.com/questions/217391/why-do-all-valve-gam...
https://www.reddit.com/r/HalfLife/comments/50xpx4/can_hl2_ever_be_port...
http://si410wiki.sites.uofmhosting.net/index.php/Portal_2
https://www.moddb.com/games/portal-2/mods
https://developer.valvesoftware.com/wiki/Portal_2
https://half-life.fandom.com/wiki/Portal
https://www.imdb.com/title/tt1648163/reviews
https://forums.blackmesasource.com/index.php/Thread/9388-Portal-2-sour...
https://www.metacritic.com/game/pc/portal-2
https://www.amazon.com/Portal-2-PC/dp/B002I0JIQW
https://pcgamingwiki.com/wiki/Portal_2
Co-Authored By:
2020-08-23