Call of Duty 4: Modern Warfare (Japan: コールオブデューティ 4 モダン・ウォーフェア) is an action-packed first-person shooter game developed by Infinity Ward and published by Activision for the Nintendo DS. It is the fourth installment in the Call of Duty franchise and is a direct sequel to the highly acclaimed Call of Duty 3. Set in a modern-day setting, the game follows the story of a US Marine Sergeant and his squad as they battle against a rogue Middle Eastern nation. Players are dropped right into the heart of the action, battling against enemies with an arsenal of weapons and equipment. The game features an immersive single-player campaign and a robust multiplayer mode, allowing players to take part in intense online battles. Players can also customize their characters and equipment with a variety of unlockables. The game features realistic graphics, detailed environments, and authentic sound effects that draw players into the explosive action. Players can also make use of the Nintendo DS's unique control scheme, which allows for intuitive control of the game's various weapons and items. With its intense gameplay, detailed visuals, and deep story, Call of Duty 4: Modern Warfare is sure to please fans of the series and newcomers alike.