In combat, auto-aim and a cover system can be used as assistance against enemies. There is a first-person perspective option when using vehicles. Players use melee attacks, firearms and explosives to fight enemies, and may run, jump, swim or use vehicles to navigate the game's world. At the beginning of the game, players can only explore the first island–composed of Dukes and Broker–with all other islands unlocking as the story progresses. Composed of the fictional city of Liberty City, the world of Grand Theft Auto IV is larger in area than most earlier entries in the series. Outside of missions, players can freely roam the game's open world, and have the ability to complete optional side missions. It is possible to have several active missions running at one time, as some missions require players to wait for further instructions or events. An Overview Grand Theft Auto IV is an action-adventure game played from a third-person perspective. Players complete missions-linear scenarios with set objectives to progress through the story.

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