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The Unstable Bridge (アンステーブルブリッジ) is a Second Stage obstacle that was added to SASUKE 23 course, replacing the Swing Ladder as the fourth obstacle. It became the third obstacle in SASUKE 24, with the Stick Slider's removal.

The obstacle featured two wooden planks to swing from. Both planks measure 60cm wide and 1.8m long. The first one would hang by four metal chains, held by one in each corner. The second plank would hang from only 2 metal chains, each down the center of the plank, one at each end. This would force the plank to easily lop-side to either the left or right side if the competitor either did not transfer from the first plank correctly, or if they lost their balance while maneuvering across to the other end.

Similar to the Delta Bridge, a competitor must hold onto to both sides while crossing. While crossing the first plank, competitors must use momentum to reach the second plank. On the second plank, competitors must reach the other side while keeping both ends even.

This obstacle was proven  to be much harder than the Swing Ladder. Although the obstacle can be beaten by those who take their time on it, like many other Second Stage obstacles, the timer forces people to rush through, causing many failures. In its first tournament, it eliminated American qualifiers Richard King (who failed the transition to the second plank) and Brian Orosco (who failed trying to reach for the ending platform) and SASUKE 22 finalist Urushihara Yuuji (who lost his balance when reaching the other side). In SASUKE 24, it eliminated Kawaguchi Tomohiro, and Sato Jun in SASUKE 25.

Unstablebridge24

The Unstable Bridge immediately following the Salmon Ladder, SASUKE 24

From SASUKE 24 forward, it was placed as the third obstacle, replacing the Stick Slider and immediately following the Salmon Ladder. The obstacle's previous position as the fourth obstacle was taken by the revamped Balance Tank.

UnstableBridgeSSK29

Unstable Bridge, SASUKE 29

From SASUKE 28 forward, the obstacle was placed after the Swap Salmon Ladder, but the second board was taken out, only the four-chained board remained. This version was proven to be much easier, as no competitors failed or even showed signs of struggling. It was removed in SASUKE 31, as it was replaced in favor of the Salmon Ladder Kudari.

American Ninja Warrior Appearances

The Unstable Bridge appeared on American Ninja Warrior 3, as the eighth obstacle during semifinal, immediately following the Salmon Ladder. However, this obstacle was proven to be much brutal than the SASUKE version, as only Ryan Stratis could complete the obstacle (likely due to the fatigue from the other competitors), which made it the highest knockout rate of any obstacle in American Ninja Warrior history (taken out 13 of the 14 competitors who've faced it, making a 92.86% knockout rate).


Las Vegas National Finals

ANW4 Unstable Bridge

American Ninja Warrior 4's Unstable Bridge in Stage Two

Later, the Unstable Bridge appeared as the third obstacle in Stage Two from American Ninja Warrior 4 to American Ninja Warrior 7, after the Double Salmon Ladder. Several top competitors had been eliminated from this obstacle, including Paul Kasemir, Brian Arnold, Noah Kaufmann, and Drew Drechsel (twice).

From American Ninja Warrior 4 to American Ninja Warrior 6, the obstacle was immediately following the Double Salmon Ladder with no rest. While on American Ninja Warrior 7, there was a resting bar placed after the Double Salmon Ladder, which gave competitors the chance to rest before attempting the obstacle.

On American Ninja Warrior 8, the obstacle was replaced by the Wave Runner (which was a combination of the Unstable Bridge and Hourglass Drop).

Competitors' Success Rate

  • All results based on the TBS/NBC broadcast and external information found
SASUKE Clears Attempts Percentage
23 8 11 72.72%
24 10 11 90.92%
25 7 8 87.5%
26 8 8 100%
27 16 16 100%
28 4 4 100%
29 17 17 100%
30 17 17 100%
Total 87 92 94.57%

American Ninja Warrior

ANW Clears Attempts Percentage
ANW3 (semifinal) 1 14 7.14%
ANW4 7 13 53.84%
ANW5 8 11 72.72%
ANW6 9 14 64.28%
ANW7 20 30 66.67%
USA vs. Japan 3 3 100%
USA vs. The World 6 6 100%
USA vs. The World 2 5 7 71.42%
Total 59 98 60.20%

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