Tenbinbashi

The Tenbinbashi (天秤橋) was the third obstacle of KUNOICHI's Second Stage for the first two KUNOICHI tournaments.

The objective of this obstacle was to cross a beam, which was 15 centimeters in width and 5,0 meters in length. This obstacle began to shake once competitors put their body weight on it, so one could not really rush through the obstacle, otherwise the beam would sway and competitors would fall off of it into the water.

Once the Third Stage was created in KUNOICHI 3, the Tenbinbashi became the final obstacle of that stage, and later appeared again in KUNOICHI 4 and KUNOICHI 6. Now, the beam was only 10 centimeters in width and lengthened to 5,5 meters in length, adding the difficulty. Also, it was made to function like SASUKE's Pipe Slider, and crushing competitors hopes of making it to the Final Stage. During KUNOICHI 3 and KUNOICHI 4 's Third Stage, there was time limit, adding the pressure to the competitors.

Most of the women who attempted this obstacle did so facing away from the obstacle, as opposed to facing towards it. After KUNOICHI 4, no one failed this obstacle, it was replaced with Mugendou, which also failed to retire anyone.

For unknown reasons, it was brought back in KUNOICHI 6, with a slight change by rounding the ending platform, and also pushing ending platform further from the beam. These changes proved to be more tricky, when it retired its lone competitor, Maeda Mizuho. After KUNOICHI 6 it was replaced with Mashou Heki, which was never attempted.

Eventually, the obstacle would return once again as the final obstacle of the Second Stage (known as the BLUE Stage) of KUNOICHI 9, and was renamed the Waver Bridge (ウェーバーブリッジ). The design was reverted back to the original version, albeit shorter. Only one competitor, Izumi Hikari, attempted and completed it.