Call of Duty 4: Modern Warfare

Call of Duty 4: Modern Warfare is a 2007 first person shooter developed by Infinity Ward, the first entry in the Call of Duty series to move away from World War II settings to a contemporary military conflict involving American and British special forces. Its multiplayer mode introduced a persistent leveling and unlockable weapon system that became widely imitated across the shooter genre, while its single player campaign was praised for tense, cinematic set pieces. It is widely regarded as one of the most influential first person shooters of its generation and is credited with reshaping the genre's competitive multiplayer conventions.