The Doorknob Arch is an obstacle, firstly introduced as the ninth obstacle on American Ninja Warrior 6 during Denver finals.
It consisted of 24 doorknobs, which were placed on an arch. Competitors must use their upper-body to traverse the doorknobs, until they were close enough to make the dismount to the landing platform.
The Doorknob Arch had a similar function with the Doorknob Grasper, except the doorknobs did not rotate, along with the different type of the doorknobs.
The Doorknob Arch returned on American Ninja Warrior 7, as the ninth obstacle during Pittsburgh finals. However, the number of doorknobs was increased to 28. This time, among the 7 competitors who attempted the obstacle, only 3 of them could complete it (Jamie Rahn, Geoff Britten, and Joe Moravsky). Despite that, the completion rate of the Doorknob Arch during Pittsburgh finals was exactly the same as during Denver finals (42.86%).