multiplayer, Grand Theft Auto IV, online gaming, PC, urban environment, Liberty City, dynamic weather, day-night cycle, street racing, car theft, action-packed, player avatars, realistic textures, detailed cityscape, skyscrapers, pedestrians, traffic, police chases, multiplayer modes, team missions, high-resolution graphics, custom vehicles, in-game chat, expansive map, 3rd person perspective, interactive gameplay, soft shadows, reflective surfaces, ambient occlusion, high-poly models, advanced lighting effects, network play, voice communication, sandbox world.