At one point, Raven Software was working on a Call of Duty: Zombies service game

In the network there was information that at some time the company Raven Software worked on the service game Call of Duty: Zombies.

This is indicated by the description of the profile on one of the sites of the former chief designer of the studio Michael Gammelt. Judging by this information, the work on the project was carried out in the period from 2011 to 2012, but then the game decided to close. The reason for this could be that the company Treyarch, which owns the rights to manage and develop the zombie mode in the Call of Duty games, demanded to curtail work in this direction.

Well, maybe it is for the best, there are enough Call of Duty games-services.