2024's Modern Warfare is essentially perfect.\n\n 2024's MW2 takes this established formula and adds a few tweaks that fit the sequel's tone better. Everything feels more realistic and grounded, especially player movements like crouching, crawling, and sprinting.
The game is free and should be totally functional on its own - if you get a message telling you to purchase Modern Warfare 2 to have access to everything, that's actually a glitch, as listed on our Warzone 2 error codes page.