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
Co-Optimus - News - Valve Updates Portal 2 With an Official PC Split-Screen Co-Op Mode
Steam Community :: Guide :: How to play Local Co-op with Controller + Keyboard
Portal 2 PC Split-Screen Tutorial with Controller + Keyboard, Mouse - YouTube
TIL: Portal 2 does not support UW splitscreen properly :( : r/ultrawidemasterrace