X2 - Six Flags Magic Mountain

X2 is a steel roller coaster operating at Six Flags Magic Mountain in Valencia, California. It is the world's first 4th Dimension roller coaster. The ride is unique in that the trains' seats pitch 360 degrees forwards and in reverse independent of the main chassis. The coaster initially opened to the public on January 12, 2002.

X2 is a unique prototype design in which the seats can rotate forward or backward 360 degrees in a controlled spin. This is achieved by having four rails on the track. Two of these are running rails while the other two are for spin control. The two rails that control the spin of the seats move up and down relative to the main track and spin the seats using a rack and pinion gear mechanism. The ride also has an on-board audio soundtrack.

X2's lift-hill climbs 175 feet (53 m) into the sky with the ride's tallest point above ground at 190 feet (58 m). During this lift, riders are facing backwards. The first drop is 215 feet (65.5 m) and is sloped at 88.5 degrees, causing the train to reach a maximum speed of 76 mph (122 km/h) (faster than X, at about 70 mph). The 3,610-foot (1100 m) long layout features two inversions including a skydive, two "raven turns", one back flip, and a twisting front flip.