If you have inconsistent mouse movement, especially when moving multiple mice, make sure the polling rates on your mice are set as low as possible. You can set the map/gamemode as you like. Change Single Player to however many players you need. In Universal Split Screen, alt-tab into Garry’s Mod so the window is selected, then click ‘Unlock Source engine for a new instance’Ĭlick Start new game. You can remove it if you want, but it is risky. You can adjust the width/height for your monitor. Right-click the new shortcut and select properties.
Right-click hl2.exe and click Create shortcut. Open the GarrysMod directory by right-clicking Garry’s mod in Steam -> Properties -> Local files -> Browse game files… In options, load the Source Engine preset.Install and run Universal Split Screen: see the quick start guide.