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https://steamcommunity.com/app/620/discussions/0/540736966074096374/
https://developer.valvesoftware.com/wiki/SDK_Installation
https://www.giantbomb.com/articles/portal-2-authoring-tools-what-valve...
http://www.thinkwithportals.com/blog.php?id=5443
http://wineskin.urgesoftware.com/tiki-view_forum_thread.php?comments_p...
https://tcrf.net/Talk:Portal_2_(Windows,_Mac_OS_X,_Linux)
https://gaming.stackexchange.com/questions/32669/download-portal-2-aut...
https://gaming.stackexchange.com/questions/25868/temporary-download-fo...
https://support.steampowered.com/kb_article.php?ref=3472-PZNM-0380
https://kotaku.com/now-you-can-make-your-own-custom-portal-2-puzzles-i...
https://www.pressthebuttons.com/2011/05/build-your-own-aperture-scienc...
https://steamvr.com/app/620/guides/?l=finnish&browsefilter=trend&requi...
https://steamvr.com/app/620/guides/?l=spanish&browsesort=trend&filetyp...
https://www.itproportal.com/2011/05/11/valve-releases-first-beta-map-m...
https://en.softonic.com/articles/valve-releases-portal-2-level-creator...
https://www.moddb.com/games/portal-2/tutorials/getting-setup-for-porta...
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2020-11-28