Big news happened yesterday in the theme park world after the parent company of Minnesota's largest theme park, Valleyfair, merged with Six Flags, so that could mean some big changes are in store for the 47-year-old park.
Six Flags has announced the next step in extreme rides: The 4D roller coaster. Basically it's a roller coaster that also flips the riders so they will somersault their way through the ride.