The Doorknob Arch first appeared as the ninth obstacle in:
- Denver City Finals of American Ninja Warrior 6, and
- Pittsburgh City Finals of American Ninja Warrior 7
It consists of an arch lined with:
- 24 doorknobs (in Denver)
- 28 doorknobs (in Pittsburgh)
Competitors must use their hands to traverse the doorknobs until they are close enough to make a jump for the landing mat before their arms and grips gave out.
It has the same function as the Doorknob Grasper.