Everyone who has faced Devil Steps has passed it (excluding American Ninja Warrior) except for one challenger in SASUKE 21.
Devil Steps is an upside-down staircase that competitors must traverse in order to move on to the next challenge. The first section is anywhere from 7 steps (five in American Ninja Warrior)(since their upside down, they're basically "grips" now.) A slightly longer step gives way to the second portion of steps (6 [3 in ANW]). It finally starts to go down, but this actually makes it harder on the wrists... there is 7 steps (9 in ANW) downward onto the platform for the next obstacle.