Run the executable file provided by the mod (often named BO1_SplitScreen.exe or managed via Nucleus Co-op ).
Play Black Ops 1 Zombies in Split-Screen on PC (The Right Way)
Save as read-only to prevent the game from overwriting.
In Nucleus Co-Op, drag Player 1's controller to Monitor 1, and Player 2's controller to Monitor 2.
Multiple instances trying to hook into a single Steam Overlay can cause instant crashes. Open Steam, right-click Black Ops 1, go to Properties , and uncheck Enable the Steam Overlay while in-game .
If you bought the game on Steam to relive those memories with a friend on the same couch, you likely noticed a glaring issue: