Split-screen on PC

The Riftbreaker

Up to 4 players on one PC, with controllers, keyboard and mouse or several keyboards and mice.

4Verified handler

Handler “The Riftbreaker” by Talos91, version 1

What works

With Nucleus Co-op, up to 4 players can play The Riftbreaker 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 “The Riftbreaker” by Talos91 does the setup and was checked by hub moderators: version 1, updated 2 Mar 2026. The Riftbreaker is a shooter, role-playing and simulation game from 2021.

Players4
ControllersSupported
Keyboard and mouseSupported
Several keyboards and miceOne per player
Hub moderatorsVerified

How to play The Riftbreaker 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 The Riftbreaker handler
In Nucleus Co-op, search the Hub for The Riftbreaker and install its handler, or download the handler file from this page and drop it on the Nucleus window. Then show Nucleus where The Riftbreaker 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 The Riftbreaker 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
The Riftbreaker 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 4 copies
Each player runs their own copy of The Riftbreaker, 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

Tested and working with latest Steam version.
Split-screen setup guide.
If a prompt saying the game did not shutdown properly shows quickly click on No to launch an instance. Create a multiplayer game in one instance and join in the others using the server browser.
Reduce graphics settings per instance to improve performance. If you use keyboards/mice after all the instances have launched, resized and positioned correctly, press the END key once to lock the input for all instances to have their own working cursor and keyboard, you need to left click each mouse to make the emulated cursors appear after locking the input. Press the END key again to unlock the input when you finish playing.
To avoid stretching in split-screen you need to create custom resolutions in your AMD/Nvidia/Intel panel (for example for a 1920x1080 monitor add resolutions like: 960x1080, 960x540, 1920x540 etc.) so the game can see and use them.
Read the FAQ if you have any further questions and want to know more about Nucleus Co-op.
Handler by Talos91. Support the Nucleus Co-op team if you love the project.

About The Riftbreaker

The Riftbreaker is a base-building, survival game with Action-RPG elements. You are an elite scientist/commando inside an advanced Mecha-Suit capable of dimensional rift travel. Hack & slash countless enemies. Build up your base, collect samples and research new inventions to survive.

Summary from IGDB