Split-screen on PC

Abyssus

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

4Verified handler

Handler “Abyssus” by Talos91, version 1

What works

With Nucleus Co-op, up to 4 players can play Abyssus 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 “Abyssus” by Talos91 does the setup and was checked by hub moderators: version 1, updated 18 Aug 2026. Abyssus is a shooter, adventure and indie game from 2025.

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

How to play Abyssus 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 Abyssus handler
In Nucleus Co-op, search the Hub for Abyssus and install its handler, or download the handler file from this page and drop it on the Nucleus window. Then show Nucleus where Abyssus 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 Abyssus 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
Abyssus 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 Abyssus, 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 clean legit Steam version as of August 18 2026.
The real game's exe is located in RGame\Binaries\Win64.
Split-screen setup guide.
Get past the tutorial or skip it in all instances, use the terminal, set your session to public and save in one instance then join in the others using the session browser.
Once in-game press the END key once to lock the input for all instances to have focus (even gamepad instances) and their own cursor (mkb instances), 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. Reduce ingame graphics settings to improve performance.
Known issue: only one keyboard/mouse works in splitscreen, multiple keyboards/mice work fine when launching one instance per monitor.
Special thanks to Nemirtingas creator of the epic emu for his incredible work, the instances can connect thanks to him.
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 Abyssus

Gather your friends and dive into Abyssus' fast-paced multiplayer shooting action. Fight through gorgeous hand-crafted levels in a roguelite adventure that will put your tactical skills to the ultimate test. Wield powerful brine-powered weapons and refit them with ancient technologies to gain an edge over your foes. Obtain divine blessings to enhance your firepower with elemental and mystic effects.

Summary from IGDB