Split-screen on PC

Space Siege

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

4Verified handler

Handler “Space Siege” by birden, version 1

What works

With Nucleus Co-op, up to 4 players can play Space Siege together on one PC, each in their own part of the screen, with keyboard and mouse or several keyboards and mice. The free community handler “Space Siege” by birden does the setup and was checked by hub moderators: version 1, updated 28 Jan 2026. Space Siege is a role-playing game from 2008.

Players4
ControllersNot supported
Keyboard and mouseSupported
Several keyboards and miceOne per player
Hub moderatorsVerified

How to play Space Siege 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 Space Siege handler
In Nucleus Co-op, search the Hub for Space Siege and install its handler, or download the handler file from this page and drop it on the Nucleus window. Then show Nucleus where Space Siege is installed.
Download the handler file (.nc)
Take a seat
Each player joins with their own keyboard and mouse 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 Space Siege 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
Space Siege 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 keyboard and mouse per player. Controllers · Keyboards and mice
A PC that can run 4 copies
Each player runs their own copy of Space Siege, 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 with the files from here (ISO): https://www.myabandonware.com/game/space-siege-iwe

Start your main game once before trying the handler.

Use LAN to host/connect. If you get an in-game firewall error and still see the other lobby, ignore it.

About Space Siege

A game filled with heavy combat action, fast-paced tactics and decision making, Space Siege is an all-new science fiction themed action-RPG being developed by Chris Taylor and his talented team at Gas Powered Games, the creators of Dungeon Siege I & II and Supreme Commander.

Summary from IGDB