The Riddler's Revenge, Stand-up steel roller coaster at Six Flags Magic Mountain, California.

The Riddler's Revenge is a steel roller coaster at the California amusement park Six Flags Magic Mountain where all riders remain standing throughout the entire journey. The track winds through six inversions and a vertical loop.

Construction began in late 1997 and the name was revealed in January 1998. The ride soft opened on April 1, 1998, and officially opened on April 4 as the park's eleventh roller coaster, a $14 million investment. It took the stand-up records for height, drop, speed, length and inversions from Chang at Kentucky Kingdom, and its 124-foot vertical loop was the world's tallest until 2000.

The ride is themed after the DC Comics character Riddler, whose question mark appears on the coaster's logo. The techno track played at the loading platform is "Ecuador (Bruce Wayne Mix)" by Sash!, a nod to Batman's secret identity. The coaster stands next to Batman: The Ride at the back of the park.

Riders must be at least 1.37 m (54 in) tall and are held by over-the-shoulder harnesses. The queue splits into eight rows near the boarding gates, and a separate single-rider line leads straight to the boarding area. The Flash Pass queue merges with the general line before the station building.

The ride generates forces more than four times as strong as normal gravity while riders remain upright throughout. The highest point of the vertical loop rises about 124 feet (38 meters) above the ground.