Split-screen on PC

Doom 3

Up to 8 players on one PC, with controllers, keyboard and mouse or several keyboards and mice.

8Verified handler

Handler “dhewm3” by birden, version 2

P4+4 more players

What works

With Nucleus Co-op, up to 8 players can play Doom 3 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 “dhewm3” by birden does the setup and was checked by hub moderators: version 2, updated 22 May 2024. Doom 3 is a shooter game from 2004.

Players8
ControllersSupported
Keyboard and mouseSupported
Several keyboards and miceOne per player
Hub moderatorsVerified

How to play Doom 3 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 Doom 3 handler
In Nucleus Co-op, search the Hub for Doom 3 and install its handler, or download the handler file from this page and drop it on the Nucleus window. Then show Nucleus where Doom 3 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 Doom 3 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
Doom 3 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 8 copies
Each player runs their own copy of Doom 3, 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

Video showcase/tutorial: https://youtu.be/PgOc1IK4v-o

The handler uses dhewm3: https://dhewm3.org/, remember you need pak000 to pak008 for the base game and pak000 and pak001 for the DLC (Resurrection of Evil).

For co-op: Download the files from here https://www.moddb.com/mods/librecoop-dhewm3-coop/downloads/librecoop-alpha-15-windows-32bits and place the files you downloaded in the dhewm3 folder.

Recommended that you add custom resolutions to all your monitors from your AMD/Nvidia/Intel panel (for example if you are using a monitor resolution of 1920x1080 add custom resolutions like 1920x540, 960x1080, 960x540, etc.).

About Doom 3

A massive demonic invasion has overwhelmed the Union Aerospace Corporation's (UAC) Mars Research Facility, leaving only chaos and horror in its wake. As one of only a few survivors, you must fight your way to hell and back against a horde of evil monsters. The path is dark and dangerous, but you'll have an array of weapons--including a pistol, a chainsaw, grenades, and more--to use for protection.

Summary from IGDB