X2, previously known as X, is a steel roller coaster located at Six Flags Magic Mountain in Valencia, California. Recognized as the world's first fourth-dimension roller coaster, it was the final installation by Arrow Dynamics. The ride is distinctive because its train seats can rotate 360 degrees forward and backward independently of the main structure. X2 opened to the public on January 12, 2002, after delays pushed its debut from the planned 2001 launch. On December 2, 2007, the coaster was closed for a significant renovation, which included a complete repaint, new third-generation trains, and enhanced special effects such as onboard audio, fog, and flame throwers. The upgraded ride reopened on May 24, 2008. In December 2000, Six Flags Magic Mountain announced a $30 million expansion for the 2001 season, introducing three new roller coasters: Déjà Vu, Goliath Jr., and the original X. This expansion brought the park’s total to 15 coasters, surpassing Cedar Point as the world’s coast...