Portal 2 PC Split-Screen Tutorial with Controller + Keyboard, Mouse - YouTube
Portal 2 update adds Big Picture split-screen | VG247
Portal 2 - Wikipedia
Portal 2 PC - local co-op (splitscreen) gameplay - YouTube
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
Portal 2 Splitscreen and Online Co-Op Detailed.
Portal 2 PC adds splitscreen co-op - GameSpot
Portal 2 two screen coop on one PC.
Portal 2 Patch Tweaks Co-op, Adds Split-Screen Via Remote Play
Portal 2 | WSGF
TIL: Portal 2 does not support UW splitscreen properly :( : r/ultrawidemasterrace
Portal 2 Gets Split-Screen Support in Big Picture Mode | Tom's Hardware
5 Couch Co-op PC games your S/O Will Love — Set Ready Game
Co-Optimus - News - How to Play Portal 2 Split Screen on Your PC