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https://en.wikipedia.org/wiki/Portal_2
https://www.gamesradar.com/spoiler-portal-2-a-prequel/
https://store.steampowered.com/app/317400/Portal_Stories_Mel/
https://theportalwiki.com/wiki/Portal:_Prelude
https://theportalwiki.com/wiki/Conversion
http://www.escapistmagazine.com/news/view/109608-Valve-Began-Developme...
http://www.thefinalhoursofportal2.com/
https://gaming.stackexchange.com/questions/20975/should-i-play-portal-...
https://kotaku.com/portal-2-wasnt-going-to-include-portals-according-t...
https://kotaku.com/where-does-portal-2s-co-op-campaign-fit-into-the-ha...
https://steamcommunity.com/app/317400/discussions/0/523890046878752049...
https://steamcommunity.com/app/620/discussions/0/846957366826603226/
https://steamcommunity.com/app/620/discussions/0/37470847892662232/
https://www.youtube.com/watch?v=0cK2ocZ2bhA
https://half-life.fandom.com/wiki/Half-Life_and_Portal_universe
https://www.rockpapershotgun.com/2011/04/27/valve-on-portal-2-spoiler-...
https://screenrant.com/portal-3-updates-rumors-release-date/
https://attackofthefanboy.com/news/portal-2-initially-intended-as-a-pr...
Co-Authored By:
2020-11-27