The simple answer is . While the initial setup is more involved than on a console, the result is a fantastic way to relive a classic. Being able to play Kino der Toten, "Five," or any of the other iconic maps with a friend on the same couch is an incredibly rewarding experience. The community has provided a brilliant solution to a longstanding problem, and with a little patience, you can have it running smoothly.

First, you'll need to download two things:

Copy the fix files into the main directory where BlackOps.exe is located.

Right-click the game, select , then click Installed Files and choose Browse .

Some manual guides and the official game manual mention that on the console versions, selecting from the main menu allows other players to join. However, on the PC version, this interface is either absent or non-functional without extensive modding. Some older forum posts suggest this could be used for split-screen with bots, but these methods are outdated, unreliable, and do not work for Zombies. For this reason, the Nucleus Co-op method is the clear winner for a proper co-op experience.

Open the script configuration file (usually a .txt or .ini file) to assign controller IDs.

: Place the Nucleus Co-op folder on the root of your drive (e.g., C:\NucleusCoop ) to avoid permission issues. Do not place it in Program Files or the game’s directory.

installed on Steam (highly recommended for compatibility). Nucleus Co-op (the tool required to force split-screen).

on a gamepad) to force the other instances to join the lobby automatically. for a quick restart or to close all instances and the Nucleus application. Troubleshooting Common Issues Antivirus Flags

While it requires a few external steps, setting up split-screen for Black Ops 1 Zombies on PC completely revives the classic couch co-op experience. By using Nucleus Co-Op, you bypass the platform limitations and can enjoy maps like Kino der Toten side-by-side with a friend, just like the console days but with the added benefits of PC frame rates and resolutions.

Open config.cfg with Notepad.

Extract the downloaded ZIP file into a dedicated folder on your PC (e.g., C:\NucleusCoop ). Do not extract it directly into your Program Files directory to avoid Windows permission issues.

This happens when XInput IDs clash. Ensure you launch Nucleus Co-Op as an administrator. If the issue persists, open the Nucleus settings and enable "Hook Focus" or "Hide Cursor" to prevent input bleed-through. Issue 2: Second Instance Fails to Join the LAN Lobby

(Xbox controllers are the most compatible).

To help me tailor this guide to your exact setup, let me know:

The application will prompt you to find the game's executable file ( BlackOps.exe ).