The Razor's Edge is an obstacle, firstly introduced as the third obstacle on American Ninja Warrior 9 in Cleveland.
Competitors must run on top of three unstable vertical boards, until they reached the landing platform to advance. The boards have an axis placed near the bottom, which made them would tilt to the left/right, if the competitors did not have the right footwork while attempting the obstacle. The first and third boards were slightly tilted to the right, while the second board was slightly tilted to the left.
Although the function of this obstacle was very simple, due to its placement after the Rolling Log, several competitors still got disoriented while attempting the obstacle. During Cleveland qualifiers, it took out 19 competitors, as well as 3 more competitors during Cleveland finals.
On American Ninja Warrior 10, the Razor's Edge appeared as the third obstacle in Miami. This time, the first and third boards were slightly tilted to the left, while the second board was slightly tilted to the right. Though only 13 competitors failed on this obstacle during Miami qualifiers, it shockingly took out JJ Woods, making it his second early exit during city qualifiers round.