Complete maps from the original saga are fully remastered and HD playable, within Call of Duty: Black Ops III.

Call of Duty: Black Ops 4 is a multiplayer first-person shooter video game. Unlike previous titles in the Call of Duty series, Black Ops 4 is the first entry to not feature a traditional single-player campaign, and contains only Multiplayer, Zombies and a new battle royale mode called Blackout.

Call of Duty: Warzone!" Free for everyone.

Call of Duty Warzone is a free to play game. It's not on GamePass and it doesn't need Xbox Live Gold either. MW2 and its multiplayer component is not free. You need to buy it if you want to play the single player game or MW2 multiplayer.