How to complete Dark Ops Challenge 2 in Blackout (Battle Royal) in COD Black Ops 4. This Challenge is called Zombie Jams and in order to complete it, you have to visit the diner on the Blackout map and interact with the jukebox.
The Blackout Mode in Call of Duty Black Ops 4 has 9 Dark Ops Challenges. None of them have a description or location attached until you find the actual challenge and complete it. Once you complete a dark ops challenge you unlock a new calling card.