Locate your BlackOps.exe file (typically found in your Steam library under steamapps\common\Call of Duty Black Ops ) and add it to Nucleus.
Download the latest version of Nucleus Co-op and extract it to a folder on your drive (e.g., C:\NucleusCo-op ). Avoid putting it in "Program Files" due to potential permission issues. Black Ops 1 Zombies Split Screen Pc
Call of Duty Black Ops 1 split screen on PC with Nucleus Co-op Locate your BlackOps
Given the complexity, Nucleus is recommended only for users with high-end gaming rigs who want to play custom zombies maps with four players (yes, 4-player split-screen is possible via Nucleus). 4-player split-screen is possible via Nucleus).