Circuit Board

The Circuit Board is an obstacle, firstly introduced as the ninth obstacle during Indianapolis finals on American Ninja Warrior 8. It is one of the most complex obstacles ever, challenging 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.

In its debut during Indianapolis finals, eight competitors reached this obstacle. While the competitors (Meagan Martin, Ryan Eliiot, and Dan Polizzi) failed it, the other five competitors completed it.

American Ninja Warrior 9
The Circuit Board returned as the ninth obstacle during Daytona Beach finals on American Ninja Warrior 9, which was very similar to the one used during Indianapolis finals on the previous season, except:
 * Some tracks were modified, and
 * There were two sets of handles that were placed at the start of the first and third panels (during Indianapolis finals, there was only one set of handles that was placed at the start of the first panel).

Once again, eight competitors reached this obstacle. This time, however, the obstacle had a 50% completion rate, as 4 competitors (Travis Rosen, Tyler Gillett, Kevin Carbone and Casidy Marks) failed it while the other four (Drew Drechsel, JJ Woods, Jessie Graff, and Sean Darling-Hammond) completed it.

Ninja Warrior Poland
On Ninja Warrior Poland 2, the Circuit Board appeared as the penultimate obstacle during the semi-finals immediately following the Salmon Ladder. The obstacle consisted of a bar before the start and only one plate. The obstacle turned out to be very difficult as only 16 competitors were able to complete it.

Keylock Hang
A modified version of the Circuit Board (named as the Keylock Hang) appeared as the first obstacle in Stage Three on American Ninja Warrior 8, replacing both Psycho Chainsaw and Doorknob Grasper from the previous season. However, 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, on the Circuit Board, competitors needed to fit the balls into series of holes, while on 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 on the Circuit Board.
 * And lastly, on the Keylock Hang, competitors have to jump to a trampoline and grab the bars that lead directly to the obstacle itself, while on the Circuit Board, competitors have to start directly to the obstacle.

Originally, the Keylock Hang was supposed to be the second obstacle in Stage Three on American Ninja Warrior 8, while the Psycho Chainsaw took its place as the first obstacle (seen via Crashing The Course). However, on the last minute, the producers decided to remove the Psycho Chainsaw for unknown reason, and replaced it with a trampoline and two laché bars, as a medium to the Keylock Hang. As the result, the number of obstacles during American Ninja Warrior 8's Stage Three was reduced from 8 to 7.

Only Drew Drechsel and Daniel Gil were able to attempt the obstacle. Both of which completed it.

American Ninja Warrior 9
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 that lead to the obstacle itself were removed. Despite that, no competitors failed on this obstacle once again (Sean Bryan, Najee Richardson, and Joe Moravsky were able to attempt and complete the obstacle). However, Najee did have a close call when he almost failed the dismount, but was able to pull himself up with his arms, averting disaster.

On American Ninja Warrior 10, the obstacle was replaced by the En Garde.

Ninja Warrior France 6
On Ninja Warrior France 6, the Keylock Hang appeared as the seventh and penultimate obstacle of Stage Two, with only one panel, and a waiting bar at the end to transfer to the next obstacle.

Competitors' Success Rate

 * All results based on the NBC broadcast and external information found

Trivia

 * The idea for the Circuit Board 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.