Halloween Horror Nights is an annual event that occurs at Universal Studios Florida, Universal Studios Hollywood, Universal Studios Singapore, and Universal Studios Japan. Universal Studios remains operational during the day and transitions to Halloween Horror Nights at night. The event features haunted houses, "scare zones", and live entertainments; many of which utilize Universal's characters and other licenses. The event is not recommended for children under 12 years old because it contains themes of terror and violence, as well as strong language.