ESRB - Mature 17+: Titles rated M (Mature) have content that may be suitable for persons ages 17 and older. Titles in this category may contain intense violence, blood and gore, sexual content and/or strong language.
Grand Theft Auto IV is structured similarly to previous games in the series. The core gameplay consists of elements of a third-person shooter and a driving game, affording the player a large, open environment in which to move around. On foot, the player’s character is capable of walking, running, swimming, climbing and jumping, as well as utilising weapons and basic hand-to-hand combat. Players can steal and drive a variety of vehicles, including automobiles, boats, helicopters, and motorcycles.
The open, non-linear environment allows players to explore and choose how they wish to play the game. Although storyline missions are necessary to progress through the game and unlock certain parts of the map and content, they are not required, as players can complete them at their own leisure. When not taking on a storyline mission, players can free-roam. However, creating havoc can attract unwanted and potentially fatal attention from the authorities.
It is possible to have multiple active missions, due to the fact that some missions will run over the course of several days and will require the player to wait for further instructions, etc. The player can also partake in a variety of optional side missions. For the first time in the series, Grand Theft Auto IV features "morality choices" at several points throughout the game, in which the player is forced to choose between killing a character or sparing their life or killing one of two characters. The game has two different endings, which are determined by decisions made by the player throughout and at the end of the game. Each choice affects the final missions the player can partake, and the fate of some characters.