Fuyuu Sou (浮遊走) was the first obstacle of the First Stage in KUNOICHI 6. It consisted of five floating platforms that sink when a competitor steps on them. The first platform was three platforms together with a board on top of them. The second was two platforms. The last three were just one platform each. Despite its straightforward objective, it took out several competitors. The obstacle was replaced by the Tobi Sou in KUNOICHI 7.