Starting in October, specially marked Mountain Dew varieties will include codes enabling the game's players to unlock double XP (experience time).
The brand is also re-introducing Mountain Dew Game Fuel --a citrus cherry flavor that was a hit with gamers -- and adding a new tropical flavor of the Fuel that was "created in collaboration with the 'Call of Duty' team specifically for 'Modern Warfare 3'," says PepsiCo.