playing COD: Modern Warfare 3

The player assumes the role of various characters during the single player campaign, changing perspectives throughout the progression of the story, which, like its predecessors, is divided into four sets of missions called "Acts". Each mission in an act features a series of objectives that are displayed on the heads up display, which marks the direction and distance between such objectives and the player. Damage to the player is shown by the percentage of health HUD shown on the screen. The player's health regenerates over time with shields also helping with regeneration. Mission objectives vary in their requirements, ranging from having the player arrive at a particular checkpoint, to eliminating enemies in a specified location, to standing their ground against enemy squadrons, manning robot mechanoids and other weapons, and planting explosive charges on an enemy installation. Some of these objectives can be failed, and may or may not hinder progression of the story. The player is also accompanied by fellow soldiers who cannot be issued orders.