Grand Theft Auto IV, which returns players to a revamped Liberty City teeming with pedestrians, vehicles, and criminal activity. The game's tongue-in-cheek version of the Big Apple features replicas of four boroughs as well as a portion of New Jersey. While the environment is smaller than the area found in 2004's Grand Theft Auto: San Andreas, the setting is more densely packed, offering a greater amount of things to see and do. A new physics model forms the backbone of the advanced 3D engine, allowing players to interact with objects and characters in more lifelike ways. The storyline is designed to offer more meaningful choices as well, with Niko able to access key contacts and messages at any time with his camera-equipped cell phone.