The Sonic Curve is an obstacle, firstly introduced as the fifth obstacle in Stage One on American Ninja Warrior 7, and appeared again on American Ninja Warrior 8, once again as the fifth obstacle in Stage One.
Competitors must run in a full speed along a series of six angled tiles that are increasing in height and are arranged in a semicircle, in order to make a jump to a rope. Once they are on the rope, they can swing it to the landing platform.
This obstacle is similar to its predecessor (the Half Pipe Attack), with the rope and landing platform remain the same.
Parkour RunA variant of the Sonic Curve, known as the Parkour Run, appeared as the fifth obstacle in Stage One on American Ninja Warrior 9, replacing the Sonic Curve itself.
It is similar to the Sonic Curve, but it has a few key differences:
- The Parkour Run consists of five angled steps and a rope, with the last step is larger than the others.
- The first four steps is similar with the ones from Snake Run, except the shape is elliptical, rather than circular.
- The fourth step is positioned away from the other steps, making it similar to the Floating Steps and forcing to switch competitors' momentum.
- The rope is attached to a spinning wheel, like the Metal Spin.
A unique completion on Parkour Run occurred during JJ Woods' run. When he got to the fourth step, he was able to jump off the step to the landing platform, rather than using the traditional method of reaching the fifth step and grabbing the rope to the landing platform. Later, this technique was also done by Drew Drechsel.
Unlike the Sonic Curve, no competitor failed on this obstacle.
- During Meagan Martin's run in Stage One on American Ninja Warrior 7, when she got to Sonic Curve, Akbar Gbaja-Biamila commented, "Ride the Sonic Curve like Sonic the Hedgehog", referencing the SEGA video game character of the same name.
- This obstacle became an inspiration for the debut of the Snake Run on American Ninja Warrior 8, which is instead of an angled tile, competitors have to run along a series of angled disks that differ in angles and are arranged in a 'S' track.