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https://store.steampowered.com/news/7923/
https://half-life.fandom.com/wiki/Perpetual_Testing_Initiative
https://steamcommunity.com/app/620/discussions/0/45350244927587680/
http://www.thinkwithportals.com/blog.php?id=7926
https://www.pcgamer.com/portal-2-perpetual-testing-initiative-is-live-...
https://www.pcgamer.com/portal-2-perpetual-testing-initiative-hands-on...
https://steamvr.com/groups/TP2PTIG
https://combineoverwiki.net/wiki/Perpetual_Testing_Initiative
https://www.engadget.com/2012/08/16/co-op-added-to-portal-2s-perpetual...
https://www.reddit.com/r/HalfLife/comments/6w6w8d/is_the_perpetual_tes...
https://kotaku.com/here-s-how-you-ll-make-test-chambers-with-portal-2-...
https://www.rockpapershotgun.com/tag/portal-2-perpetual-testing-initia...
https://gamerant.com/portal-2-perpetual-testing-initiative-dlc/
https://www.geek.com/games/portal-2-perpetual-testing-initiative-begin...
https://www.theverge.com/2012/5/8/3007881/good-deal-portal-2-sale-perp...
https://www.tweaktown.com/news/23995/portal_2_s_dlc_perpetual_testing_...
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2020-10-25