How to play the game “Call of Duty“? What are some strategies and guides for it?

The following guide is only for multiplayer mode. Each generation of the campaign has its own differences. Except for a few titles that have certain branches, most of the games maintain a linear progression, so it’s recommended to play continuously according to the game’s path. If you find the difficulty too high and unable to proceed, it is suggested to lower the difficulty level.

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