Call of Duty 4: Modern Warfare is a first-person shooter video game, developed by Infinity Ward and published by Activision for the Microsoft Windows and Mac OS X personal computers and the Xbox 360, PlayStation 3 and Wii video game consoles. The game was released in North America, Australia, and Europe in November 2007 for video game consoles and Windows, was released for the Mac in September 2008, and was released for the Wii in November 2009. It is the fourth installment in the Call of Duty video game series, excluding expansion packs, and is followed by a direct sequel, Call of Duty: Modern Warfare 2. The game breaks away from the World War II setting of previous games in the series and is instead set in modern times. Call of Duty 4 was in development for two years, and it uses a proprietary game engine.
The story takes place in a fictional near-future, where a radical leader has staged a coup d'?tat in the Middle East, and an "Ultranationalist" movement has instigated a civil war in Russia. The events of the conflicts are seen from the perspectives of an American Marine and a British SAS commando, and are set in multiple locations, including the Middle East, Azerbaijan, Russia, and Prypiat, Ukraine. The multiplayer portion of the game features various game modes, and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance.
Critically acclaimed, the game received an aggregated score of 94% from both GameRankings and Metacritic. The gameplay, multiplayer, and story received particular praise, while criticism targeted what was perceived as an inability to innovate the first-person shooter genre. The game won numerous awards from gaming websites, including IGN's Best Xbox 360 Game. It was the top-selling game worldwide for 2007, reaching over seven million copies by January 2008, and over 13 million by May 2009.
MultiplayerCall of Duty 4 features team-based and deathmatch-based multiplayer modes on various maps. Each mode has an objective that requires unique strategies to complete. Players can call in UAV reconnaissance scans, air strikes, and attack helicopters, either an AH-1 Cobra for S.A.S. or USMC or an Mil Mi-24 for OpFor or Spetsnaz, when they achieve three-, five-, and seven-enemy kill streaks respectively. A game ends when either a team has reached a predefined number of points, or the allotted time expires in which case the team with the most points wins. However in the rare case the points are even when the time expires, Sudden Death mode is activated in which there is no re-spawning and the team who either has the last man standing, or achieves the objective first are the winners.
The player's performance in the multiplayer mode is tracked with experience points, earned by taking down other players, completing objectives, or by being a member of a winning team. As the player gains experience, they advance in level, unlocking new weapons, perks, challenges, and gameplay modes. The highest obtainable level is 55, but on the console versions of the game, the player has the option to play "Prestige" mode; this resets their level back to 1 and all earned bonuses are lost in exchange for a special in-game insignia. This process can be repeated up to 10 times with a different insignia being given each time, giving the player a total of 604 levels to achieve.
Completing a challenge grants experience points and may unlock weapon attachments. When a player's level increases, it may unlock new weapons, perks, or challenges. At lower experience levels, the player only has access to five pre-determined classes, and cannot create a custom class with the weapon of their choosing. However, as the player advances in levels, they earn the ability to customize their classes. This includes selecting their main weapon, side arm, and special grenade type. Additionally, the player can select a limited number of "perks" that can customize their character further. Perk effects include increasing damage by the player, being able to take more damage, or dropping a live grenade after being killed in an act of martyrdom. The player is also given challenges to attempt, including achieving a certain number of kills with a specific weapon or shooting down a helicopter or performing a number of head shots