The zombie mode is one of the most popular in the Call of Duty games. It seems that soon on Xbox One and Xbox Series it will be possible to try this mode for free in the latest available game in the series – Call of Duty: Black Ops Cold War.
A Call of Duty®: Black Ops Cold War – Free Zombie Access page has been added to the Microsoft Store, which states that Zombie Mode is available for free between January 14-21.
Call of Duty®: Black Ops Cold War – Free Zombies Access
Black Ops Cold War ‘Zombies’ mode invites seasoned players and newbies to take part in a chilling adventure that continues the legendary part of the Call of Duty franchise. This co-op mode includes new progression methods, classic perks, and an arsenal of Cold War zombie weapons to help survivors defeat legions of undead.