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https://en.wikipedia.org/wiki/Source_(game_engine)
https://wiki.sourceruns.org/wiki/Differences_between_Source_Engine_bra...
https://support.steampowered.com/kb_article.php?ref=1445-TKCN-0831
https://store.steampowered.com/app/400/Portal/
https://www.moddb.com/mods/portal-source-sdk-edition
https://steamcommunity.com/discussions/forum/7/215439774869100392/
https://www.reddit.com/r/HalfLife/comments/50xpx4/can_hl2_ever_be_port...
https://gaming.stackexchange.com/questions/217391/why-do-all-valve-gam...
https://half-life.fandom.com/wiki/Half-Life_and_Portal_universe
https://combineoverwiki.net/wiki/Source_SDK
https://www.vice.com/en_us/article/vdbj44/how-valves-source-engine-too...
https://theportalwiki.com/wiki/Portal
https://pcgamingwiki.com/wiki/Portal
https://www.phoronix.com/vr.php?view=12330
https://www.theverge.com/2012/2/15/2799112/portal-unofficial-android-u...
http://lambdageneration.com/news/other/source-engine-2007s-source-code...
https://github.com/RubberWar/Portal-2
Co-Authored By:
2020-11-27