Update!

Universal Split Screen has been superseded by Proto Input, which is part of Nucleus Co-Op.

Getting Started

Quick Start Important notes Virtual super resolution Goldberg Emulator Untested Games Setup x360ce Guide

Borderlands 2 Borderlands 3 Counter Strike Global Offensive Don't Starve Together Endless Space Factorio Garry's Mod Half-life Left 4 Dead 2 Minecraft Nuclear Throne Prison Architect Starbound Stardew Valley Sven Co-op Team Fortress 2 Terraria

Half-life

Half Life supports keyboards, mice and controllers so you can use any combination.

Universal Split Screen setup

Install and run Universal Split Screen: see the quick start guide.
In options, load the GoldSrc Engine preset.
Go back to the Current window tab.

Half Life setup

Open the Half Life directory by right-clicking Half Life in Steam -> Properties -> Local files -> Browse game files…
Launch hl.exe as many times as you need.
- GoldSrc Engine games will usually not let you launch more than one instance. In Universal Split Screen, alt-tab into Half Life so the window is selected, then click ‘Unlock Source engine for a new instance’
Go to Options -> Mouse. Set Raw mouse input to disabled. Set Joystick to enabled if you are using a controller. (If you are using a controller, make sure to also enable Hook XInput in Universal Split Screen).
On the first instance, use the server browser to find a server (Find a server without Valve Anti Cheat, just in case). Right-click -> View server info. Copy the IP Address.
In all instances, at the main menu, use the ` (tilde) key to open the console. This key is usually above the tab key.
Type connect IP and click Submit, replacing IP with the IP you copied, e.g. connect 123.456.789.123
You should now be connected to the same game.

Tips before you start

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 usually set this in your mouse configuration program (look on the manufacturer’s website).
Disable steam overlay by right-clicking Half Life in Steam -> Properties and un-check ‘Enable the Steam Overlay while in-game’
If you want to start and stop split screen, you should restart all instances of the game or it will start to slow down significantly.

Split screen setup

Install and run Universal Split Screen: see the quick start guide
In options, load the GoldSrc Engine preset (if you have not already done so).
Go back to the Current window tab. Alt+tab into the first instance. Set the mouse and keyboard or controller. Repeat for the other instances.
Click Start split screen. You should now be able to play. Press End to stop.