The epic 25th year of the nationÕs best Halloween event, Universal OrlandoÕs Halloween Horror Nights, marks the biggest, longest and most intense event in history with nine haunted mazes, five unique scare zones and two thrilling shows. On select nights Sept. 18 through Nov. 1, guests can visit Universal OrlandoÕs theme parks by day and by night, become victims of their own horror film at Halloween Horror Nights 25.