Each choice affects the missions the player can partake and the fate of some characters. Niko witnessed many atrocities and war crimes, including a number of children lined up against a church wall, each with their throats slit and hands cut off.
One of the biggest changes from previous installments was 's ability to take advantage of the Internet connectivity that virtually all consoles of the time had built in.
A number of multiplayer game modes are offered, from classic deathmatch and team deathmatch to team-based co-op missions.
The characters that appear in Grand Theft Auto IV are relatively diverse and relative to the respective boroughs of Liberty City they are based in, belonging to various gangs and ethnic groups.
The player controls Niko Bellic, an immigrant from Eastern Europe.
However, several high-profile DJs host the various radio stations within the game such as Iggy Pop, Karl Lagerfeld, Juliette Lewis, Daddy Yankee, and real life DJs like DJ Premier, DJ Green Lantern, Lazlow, and real life comedians Katt Williams and Ricky Gervais can be seen at the Comedy Club and also be heard being interviewed on the in-game radio station WKTT.
For the first time in the series, Grand Theft Auto IV features "morality choices" in several points of the game, in which the player is forced to choose between killing or sparing a character, or killing one of two characters.
According to Dan Houser, "virtually none of the characters from the previous games returned, as the GTA IV era is set in a parallel universe compared to the GTA III era.
Unlike previous games in the series, the voice actors of Grand Theft Auto IV do not include notable and high-profile celebrities, instead opting for lesser known actors such as Michael Hollick, Jason Zumwalt, Tony Patellis, Moti Margolin, Ryan Johnston, Thomas Lyons, Frank Bonsangue, Timothy Adams and Coolie Ranx.
The three internet girls will also offer an ability that you can call them up to use.