Located in the center of town, next to the Tokyo Dome stadium, this amusement park features a high-tech Ferris wheel called the Big O (hollow in the middle, with no spokes and no hub); the heart-stopping Thunder Dolphin roller coaster, which passes through the Big O at speeds reaching up to 130kmph (81 mph); the Tower Hacker, which drops straight down from a height of 80 m (262 ft.); and a water ride, simulation theater, game arcade, bowling alley, and other amusements packed into cramped quarters.