According to😊 Microsoft's official website, Black Ops 2 is indeed listed as a backwards compatible game for both the Xbox One and😊 Xbox Series X/S consoles. This information can be found on the official Xbox website or by accessing the list of😊 backwards compatible games through the console's user interface.

Invincibility. While playing, hit ESC to pause the game and type in "RATTY RAT RATTY".