GTA 5 is an action-adventure game played from either a third-person or first-person perspective. Players needs to complete missions—linear scenarios with set objectives—to progress through the story. Outside of the missions, players can roam freely anywhere in the open world.Composed of the San Andreas open countryside area, including the fictional Blaine County, and the fictional city of Los Santos, the world is much larger in area than earlier entries in the series. It may be fully explored after the game's beginning without restriction, although story progress unlocks more gameplay content. The player character crouched behind a vehicle while in combat. The head-up display elements are visible on-screen. Players can take cover behind objects during firefights to avoid taking damage from enemies. Players use melee attacks, firearms and explosives to fight enemies, and may run, jump, swim or use vehicles to navigate the world. To accommodate the map's size, the game introduces vehicle types absent in its predecessor Grand Theft Auto IV, such as fixed-wing aircraft. In combat, auto-aim and a cover system may be used as assistance against enemies..