Activision is making a significant change to the upcoming Call of Duty: Black Ops 4 video game.  

Per Polygon's Chris Plante, Call of Duty: Black Ops 4 won't include a traditional single-player campaign mode with more focus being placed on the multiplayer modes and the zombie mode first introduced in 2009. 

Plante also cited an anonymous source who noted that development studio Treyarch, which is making this year's title, wouldn't be able to complete the single-player campaign before the game's release date. 

Instead of a traditional campaign mode, the co-op mode could serve as a replacement option. 

Call of Duty: Black Ops 4 will have a reveal event on May 17, with the game scheduled to be released worldwide on Oct. 12.