New Jersey Is About To Get The World's Tallest And Fastest Spinning Roller Coaster. Six Flags Great Adventure just announced BAKUNAWA, a record-breaking roller coaster set to open in 2027, and it's already being billed as one of the most extreme rides ever built. The new coaster stands 382 feet tall, making it the world's tallest and fastest spinning launch coaster, reaching speeds of 100 mph while riders spin freely throughout the experience. It will be one of the five tallest roller coasters on Earth. BAKUNAWA is scheduled to open during the 2027 season at Six Flags Great Adventure in Jackson, New Jersey.