In essence, the Buyoishi was comprised of eight small, rounded spherical objects attached to the top of a short cylindrical pole. Competitors must walk on the spheres one by one to reach the landing platform to advance.
This obstacle was proven to be lethal, especially in it's first two tournaments where more than fifty competitors failed there. It is one of KUNOICHI's most iconic obstacles. This obstacle was not used on KUNOICHI 6, and was retired for good because of the revamped KUNOICHI 9.
KUNOICHI 1-2 Version
The first version of Buyoishi was one of the hardest, if not the hardest version of this obstacle. In it's first two tournaments the top of the obstacle was extremely small, and most competitors could not even put their foot on the obstacle without part of it dangling off. In addition, the spherical tops seemed to have been extremely slick (more so than in later tournaments at least) causing many competitors to reach the landing mats, only to fall into the water next to them.
KUNOICHI 3 & 8 Version
In the third tournament, Buyoishi returned, and was still the first obstacle. However, the spherical tops were now much larger, and many competitors could fit their entire foot on the top. While it wasn't as dangerous as it's predecessors, it still did good damage, taking out at least thirty competitors. Despite it finding it's niche in this tournament, it was modified for the next tournament.
This version of Buyoishi returned in the Second Stage for the eighth tournament. Like it's predecessor in KUNOICHI 7, the obstacle were colored silver, but had been modified to lose the spring-loaded post.
KUNOICHI 4-7 VersionThe third incarnation of of Buyoishi rivaled it's first predecessor. While it remained virtually unchanged from KUNOICHI 3's version, the producers decided to up the difficulty by making one of the spherical tops was spring-loaded. This proved to be the modification the producers wanted as it stopped competitors from skipping the majority of the obstacle, and set up a virtually pre-determined path that required the competitors to traverse six of the eight posts. This version did good damage, as it took out top competitors such as Mizuno Yuko in KUNOICHI 4 and proved to be a great time waster, causing many other competitors to time out. This version remained the first obstacle in the First Stage for two tournaments. After a one tournament hiatus, it returned in KUNOICHI 7's Second Stage virtually unchanged. The only difference between it's First Stage counterpart was that the obstacle was now colored silver. As the Second Stage obstacle, it eliminated no competitor.
The Buyoishi (called as the Dancing Stones) appeared as the third obstacle on American Ninja Warrior 6 in Miami. In this version, the spherical tops were made much larger than in KUNOICHI. However, competitors were not allowed to use their hands while attempting the obstacle. Despite that, the obstacle was proven to be relatively easy for the competitors (eventhough 7 competitors failed on this obstacle during Miami finals, including Brett Sims, Idoko Abuh, William Brown, and Reko Rivera).
Later, the Dancing Stones was also used as the fourth obstacle on Team Ninja Warrior (competitors could use their hands on this competition).
On Ninja Warrior UK, the Dancing Stones appeared as the third obstacle in every qualifying heat, with only five spherical tops and touching the tops with hands was not allowed.
Competitors' Success Rate