Call of Duty 4: Modern Warfare is the fourth installment of the main series, and was developed by Infinity Ward. It is the first game in the series not to be set. NEW Ali-A video – Hit “LIKE” and enjoy! :D Follow me on Twitter: NEW Ali-A tshirts! – Enjoy. NEW Ali-A video – Hit “LIKE” and enjoy! :D Follow me on Twitter: NEW Ali-A tshirts! – Enjoy. The online multiplayer mode of Modern Warfare 2 retains the same experience points and unlockable reward system as that of Call of Duty 4, with game modes that. About This Game Outnumbered and outgunned, but not outmatched. Call of Duty®: Ghosts is an extraordinary step forward for one of the largest entertainment franchises.