Portal 2 PC finally gets split-screen co-op | Eurogamer.net
Portal 2 Pc | Peatix
Goind through a portal while in a beam makes my system hang on coop · Issue #329 · ValveSoftware/portal2 · GitHub
Portal 2 | WSGF
Portal 2 Coop Split-Screen - YouTube
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
Portal 2 Update Adds Big Picture Support, Split-Screen And More - GameGuru
Steam Community :: Guide :: How to play Local Co-op with Controller + Keyboard
Co-Optimus - News - How to Play Portal 2 Split Screen on Your PC