Split-screen on PC

Garry's Mod

Up to 16 players on one PC, with controllers, keyboard and mouse or several keyboards and mice.

16Verified handler

Handler “GarrysMod” by Talos91, version 7

P4+12 more players

What works

With Nucleus Co-op, up to 16 players can play Garry's Mod together on one PC, each in their own part of the screen, with controllers, keyboard and mouse or several keyboards and mice. The free community handler “GarrysMod” by Talos91 does the setup and was checked by hub moderators: version 7, updated 23 Jul 2026. Garry's Mod is a simulation and indie game from 2004.

Players16
ControllersSupported
Keyboard and mouseSupported
Several keyboards and miceOne per player
Hub moderatorsVerified

How to play Garry's Mod split screen on PC

Get Nucleus Co-op
Download Nucleus Co-op, free for Windows 10 and 11, and unzip it into its own folder, for example C:\NucleusCo-op. There is no installer.
Keep it out of Program Files, your user folder and OneDrive.
Download Nucleus Co-op
Install the Garry's Mod handler
In Nucleus Co-op, search the Hub for Garry's Mod and install its handler, or download the handler file from this page and drop it on the Nucleus window. Then show Nucleus where Garry's Mod is installed.
Download the handler file (.nc)
Take a seat
Each player presses a button on their own controller to join and takes a spot on the screen. Pick a layout that fits your players.
Playing with several keyboards and mice? Press End once everything is in place to give each window its own cursor.
Launch and connect
Press Launch: Nucleus opens one copy of Garry's Mod per player and lays the windows out on your screen. Then link them in game, usually one player hosts a LAN or online session and the others join it. The handler notes say how.

What you need

A Windows 10 or 11 PC
Nucleus Co-op runs on Windows only. System requirements
Garry's Mod for Windows
Installed on that PC. Nucleus starts every player's window from that one install.
Nucleus Co-op, free
With .NET Framework 4.7.2 or later and the Visual C++ 2015–2022 runtimes (x86 and x64). Download
Something to play with
One controller per player, or one keyboard and mouse per player. Controllers · Keyboards and mice
A PC that can run 16 copies
Each player runs their own copy of Garry's Mod, so the PC carries several times the usual load. Lower the graphics settings if it struggles. Performance tips
A multiplayer mode
Nucleus links the windows through the game's own LAN or online mode; the handler takes care of it.

Handler notes

Guide: https://www.reddit.com/r/localmultiplayergames/comments/cie9et/garrys_mod_splitscreen_multiplayer/

Authors and Contributors of this handler: Talos91 from the Split Screen Dreams Discord.

About Garry's Mod

Garry's Mod is a physics sandbox. Unlike regular games there aren't any predefined aims or goals. We give you the tools and leave you to play. You spawn objects and weld them together to create your own contraptions - whether that's a car, a rocket, a catapult or something that doesn't have a name yet - that's up to you. If you're not too great at construction - don't worry! You can place a variety of characters in silly positions. Garry's Mod also has integrated Steam Workshop mods, allowing for infinite creativity, diverse and exciting gamemodes and various playstyles.

Summary from IGDB