Kingda Ka is a hydraulically-launched steel roller coaster located at Six Flags Great Adventure in Jackson, New Jersey, United States. Manufactured by Intamin and designed by Werner Stengel, Kingda Ka opened as the tallest and fastest roller coaster in the world on May 21, 2005, surpassing Top Thrill Dragster.
Phantom's Revenge is a steel hypercoaster located at Kennywood amusement park in West Mifflin, Pennsylvania, United States. It originally opened as Steel Phantom in 1991, featuring the fastest speed and longest drop of any roller coaster in the world.