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Cooperative Testing Initiative – Portal Wiki
https://theportalwiki.com/wiki/Cooperative_Testing_Initiative#:~:text=The%20Cooperative%20Testing%20Initiative%2C%20or,built%20specifically%20for%20cooperative%20testing.
The Cooperative Testing Initiative, or simply co-op, is a multi-player gamemode and campaign in Portal 2 whereby two players can join up and take part in test courses built specifically for cooperative testing.Jun 17, 2022
Portal 2 on Steam
https://store.steampowered.com/app/620/Portal_2/
Complete two-person co–op: Multiplayer game featuring its own dedicated story, characters, and gameplay. Advanced physics: Allows for the creation of a whole …
Programme de Test Coopératif – Portal Wiki
https://theportalwiki.com/wiki/Co-op/fr
Le Programme de Test Coopératif, ou simplement coop, est un mode de jeu multijoueur et une campagne de Portal 2 où deux joueurs peuvent se …
Portal 2 continue de se mettre à jour et améliore son mode coop
https://www.jeuxvideo.com/news/1147773/portal-2-continue-de-se-mettre-a-jour-et-ameliore-son-mode-coop.htm
Après huit ans d’existence, le désormais classique jeu de réflexion Portal 2 continue de mettre à jour l’Aperture Science sur Steam.
Does Portal 1 and 2 has Multiplayer??? :: Help and Tips
https://steamcommunity.com/discussions/forum/1/619569608524600090
Portal 2 does (co–op). Portal 1 is single player. #1. Hextravert.
Guide :: How to play Local Co-op with Controller + Keyboard
https://steamcommunity.com/sharedfiles/filedetails/?l=french&id=239373369
Yes, there is an offline splitscreen co–op mode in the PC version of Portal 2. To play it, all you need is a couple controllers, go Play Co–op game and …