If you are interested in modding games to support local split screen co-op you might want to check out Nucleus Co-op | + Links to links to PartyDeck (Linux) and other multiplayer mods

https://nucleus-coop.github.io/

You can check out the full list of supported games here but some examples are Minecraft, Skyrim, Elden Ring, and The Long Dark.

There's a Nucleus Coop Steam curator that can tell you what games on Steam are compatible.


Heads Up

I would recommend reading the notes behind the handler of the game you wish to modify before attempting to install them.

Handlers vary in how local split screen co-op is implemented. Some add it to a normally single player campaign (ex. Fallout New Vegas uses NVMP) while others add it to existing multiplayer modes (ex. Dying Light) or unofficial multiplayer modes (ex. Grand Theft Auto IV uses Grand Theft Auto Connected).

Due to this some games feel more polished than others. The complexity and length of setup also varies but it's generally pretty straightforward. I'd say setup usually takes 30 minutes. The most annoying part for me (besides how sluggish Nucleus Co-op's app feels) was alt-tabbing out of various game windows to configure the settings in game to work.


Linux

All reports I have seen say that Nucleus co-op does not work on Linux despite attempts at tinkering.

The closest alternative I have seen for Linux is PartyDeck. A GamingOnLinux article about it from May 2025 can be found here.

Other alternatives that I have seen recommended like Co-op-on-Linux haven't been updated in years.


Bonus

If you are interested in multiplayer mods in general FMHY has a tab dedicated to multiplayer mods and the website Unmoddable has articles about many of them.

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