The best split-screen games for PC | Digital Trends
Portal 2 PC - local co-op (splitscreen) gameplay - YouTube
Portal 2: Co-op Splitscreen Multiplayer Gameplay Walkthrough - GOOD GAME | Part 2 - YouTube
Portal 2 In Motion: Free Co-op Campaign Out Today – PlayStation.Blog
You Can Now Play Portal 2 Local Co-op On PC | Kakuchopurei
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