Corkscrew is a steel roller coaster built by Arrow Development at Cedar Point in Sandusky, Ohio, United States. When built in 1976, it was the first roller coaster in the world with 3 inversions. The coaster, which features Arrow's first vertical loop, was built during the same time period as The Great American Revolution at Magic Mountain. However, Revolution opened seven days prior and is therefore credited as the first modern-day coaster to feature a vertical loop.