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 (single PC multiplayer)
Steam Community :: Guide :: How-To: Play Workshop Coop Maps Solo
Steam Community :: Guide :: How to play Local Co-op with Controller + Keyboard
Portal 2 PC finally gets split-screen co-op | Eurogamer.net
PC gamers can now play Portal 2 split-screen
Playing splitscreen for the first time. How do I switch which side of the screen I appear on? I want to be on the left not the right. I'm playing on mouse
TIL: Portal 2 does not support UW splitscreen properly :( : r/ultrawidemasterrace
Local co-op controls overridng :: Portal 2 General Discussions
Portal 2 PC finally gets split-screen co-op | Eurogamer.net
Co-Optimus - News - Valve Updates Portal 2 With an Official PC Split-Screen Co-Op Mode
Portal 2 Taught Me Everything I Know About Onboarding | by Matt Hackett | Medium