The US renaming of "noughts and crosses" to "tic-tac-toe" occurred in the 20th century. In 1952, OXO (or Noughts and Crosses), developed by British computer scientist Sandy Douglas for the EDSAC computer at the University of Cambridge, became one of the first known video games.
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.
The base Battle Pass is free to all players. However, upgrading to the full Battle Pass either as a standalone purchase or included in the BlackCell Battle Pass Bundle is an optional addition to your Modern Warfare III and Warzone experience.