(18/1/2007) I made a power point about Millenium Force. I learned that a hyper coaster is a roller coaster with a height somewhere from 200 feet to 299 feet. Then there is Giga Coaster (like Millunium Force) Its height has to be somewhere from 300 feet to 399 feet. Then there's Strata Coaster. Its height has to be from 400 feet to 499 feet. Note: Kingda Ka and Top Thrill Dragster are the only strata coasters.