video game, Grand Theft Auto IV, multiplayer mode, online gameplay, action, urban environment, Liberty City, dynamic weather, day and night cycle, realistic car physics, street races, cooperative missions, deathmatches, player customization, voice chat, open-world exploration, high-rise buildings, cityscape, detailed textures, reflections, ambient occlusion, soft shadows, 3/4 view, interactive HUD, network connection, console or PC gaming, immersive sound effects, action-packed, high-resolution textures.