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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
Communauté Steam :: Guide :: How to play Local Co-op with Controller + Keyboard
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
Co-Optimus - News - How to Play Portal 2 Split Screen on Your PC
The Best Xbox 360 Co-op Offline Split-Screen Games - LevelSkip
Portal 2 on Steam adds split-screen to co-op mode, Big Picture support - Polygon