Portal 2 on Steam adds split-screen to co-op mode, Big Picture support - Polygon
Portal 2 | Half-Life Wiki | Fandom
Amazon.com: Portal 2 - Xbox 360 : Video Games
15 Best Xbox One Split-Screen Games - Cultured Vultures
Portal 2 Gets Split-Screen Support in Big Picture Mode | Tom's Hardware
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 PC Split-Screen Tutorial with Controller + Keyboard, Mouse - YouTube