Weeks after its official release, a Call of Duty: Black Ops 6 developer says the game being included in Microsoft's monthly Game Pass subscription service helped convince more people to try it out. Black Ops 6 is the first Call of Duty title to be available on Xbox Game Pass the same day it was released worldwide, which initially caused concerns about the game's overall performance. However, Call of Duty: Black Ops 6 has proven to be a massive sales hit, even though the game is free for Game Pass subscribers.