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https://steamcommunity.com/workshop/about/?appid=620
https://steamcommunity.com/sharedfiles/filedetails/?id=1285982245
https://www.pcgamer.com/uk/portal-2-maps-13-inventive-innovative-commu...
https://www.reddit.com/r/Portal/comments/67b9il/portal_2_community_tes...
https://developer.valvesoftware.com/wiki/Category:Portal_2_Level_Desig...
https://theportalwiki.com/wiki/Steam_Workshop
http://www.thinkwithportals.com/blog.php
https://half-life.fandom.com/wiki/Perpetual_Testing_Initiative
https://steamvr.com/groups/Portal2TestMakers
https://gaming.stackexchange.com/questions/72925/how-do-i-play-portal-...
https://www.eurogamer.net/articles/2011-05-25-portal-2-top-10-test-cha...
https://arstechnica.com/civis/viewtopic.php?f=22&t=1204933
https://www.thesixthaxis.com/2012/05/11/perpetual-testing-with-portal-...
https://www.commonsense.org/education/game/portal-2-puzzle-maker
Co-Authored By:
2020-08-12