The Circuit Board is an obstacle, firstly introduced as the ninth obstacle in Indianapolis finals on American Ninja Warrior 8. It is one of the most complex obstacles ever, challenging competitors both physically and mentally.
Competitors had to use two handles with a ball on each handle (one big, one small) and navigate them through a series of 58 holes, with tracks attached across four panels (the panels were 25 feet in total length), above 15 feet from the water. The balls on the handles could only fit in certain holes.American Ninja Warrior 9, which was very similar from Indianapolis finals, except:
- Some tracks were modified, and
- There were two sets of handles that were placed at the start of the first and third panel (in Indianapolis finals, there was only one set of handles that was placed at the start of the first panel).
Keylock HangA modified version of this obstacle, named the Keylock Hang, was placed as the first obstacle in Stage Three on American Ninja Warrior 8, replacing both Psycho Chainsaw and Doorknob Grasper from last season. There were significant differences between this obstacle and the Circuit Board.
- Firstly, the Circuit Board used two handles with different size balls on each handle, while the Keylock Hang used two handles with same size cylinders on each handle.
- Secondly, in the Circuit Board, competitors needed to fit the balls into series of holes, while in the Keylock Hang, competitors needed to unlock the handles into series of holes.
- Thirdly, the Keylock Hang had 3 panels, in comparison to 4 panels in the Circuit Board.
- And lastly, in the Keylock Hang, competitors have to jump to a trampoline and grab the bars that lead directly to the obstacle itself, while in the Circuit Board, competitors have to start directly to the obstacle.
The Keylock Hang returned on American Ninja Warrior 9, as the second obstacle in Stage Three, with several holes and panels were modified. Also, the bars leading to the obstacle itself were removed. Despite that, no competitors failed on this obstacle once again.
- The idea for this obstacle came from a traditional gym peg board, but the horizontal and vertical handholds stick because of friction. So, the producers flipped it upside-down and made more of a mind game out of it.