Call of Duty: Modern Warfare 2 is a first person shooter, and its gameplay revolves around fast-paced gunfights against enemy combatants. The player controls a soldier who can perform several actions, including jump, sprint, crouch, lay prone, and aim down their gun's iron sights. When the player is shot by an enemy, blood will splatter their heads-up display (HUD), denoting that they have taken damage; if the player avoids gunfire by taking cover, their health will recover. The HUD also displays other information, such as a compass, a mini-map, and the player's current ammunition count. The game features traditional guns, including assault rifles, shotguns, handguns, and sniper rifles. The player will be given specific guns at the beginning of each level, but may switch them out with another gun they find. Some guns have attachments, such as suppressors, and heartbeat sensors. The player can use grenades and flashbangs when faced with a large group of enemies, as well as a knife for close quarters combat. In some levels, the player will be given special equipment, such as night vision goggles, or a laser designator.