video game, Grand Theft Auto IV, online multiplayer, action-packed, urban environment, Liberty City, dynamic lighting, realistic textures, detailed character models, player-controlled character, street racing, gunfights, police chases, open-world exploration, skyscrapers, cityscape, day-night cycle, weather effects, high-resolution textures, 3rd person perspective, interactive gameplay, custom avatar, voice chat, team strategy, PvP combat, cooperative missions, in-game economy, immersive sound design, HUD interface, online leaderboard, network connection, console gaming, PC gaming.