Portal 2 PC finally gets split-screen co-op | Eurogamer.net
Portal 2 on Steam
Steam Community :: Guide :: How-To: Play Workshop Coop Maps Solo
Portal 2 Co-Op Hands-On - GameSpot
Portal 2 PC Split-Screen Co-Op
Portal 2: Reflection and Cooperation - Médiation thérapeutique avec les Jeux Vidéo
TIL: Portal 2 does not support UW splitscreen properly :( : r/ultrawidemasterrace
Uhh wtf? What's happening here? (Portal Reloaded coop in split screen, as I can't find ppl. btw it's so damn confusing, and I've played the whole singleplayer campaign...) : r/Portal
Portal 2 PC - local co-op (splitscreen) gameplay - YouTube