SPLITSCREEN INSTRUCTIONS: forums.steampowered.com This is a video showing that split-screen mode is indeed possible to achieve in the PC version of Left 4 Dead. Not only does it still run just as good, but it works really well, too. In this segment, I start off by playing using the 360 controller (bottom screen), then switch to the mouse/keyboard (top screen) for the latter half of the video. I had nobody on-hand to play with me at the same time, so unfortunately this isn’t a great example of what can be achieved with it.