The concept of this obstacle was similar to the Gliding Ring/Cannonball Drop, where competitors had to slide down a giant ring in an angled track, with the track having two notches as stoppers (one notch for Team Ninja Warrior: College Madness), where they had to raise the ring to move on.
Due to the obstacle being placed in a side-by-side course, it forced the competitors to quicken their pace to complete the obstacle. Some competitors went over the notches in one go, but others got stuck on the notches, which forced them to raise the ring. Even though its function was simple, it took out 28 competitors on Team Ninja Warrior 2, including Brent Steffensen, Neil Craver, Tremayne Dortch, Jamie Rahn, Lorin Ball, Geoff Britten, Daniel Gil, and Flip Rodriguez (who fell on the obstacle twice), which was due to not holding on to the ring long enough or failing the dismount.
The Ring of Fire appeared on Ninja Warrior UK 3, as the fifth obstacle during the semi-finals, and then as the seventh obstacle during the semi-finals on Ninja Warrior UK 4. However, the obstacle was called as the Ring Slider (not to be confused with the Ring Slider from SASUKE). Also, competitors needed to climb up a pole to reach the ring.
On Ninja Warrior UK 3, the obstacle eliminated the most number of competitors than any other obstacle during the semi-finals, mostly due to getting stuck at the second notch and spending too much time at the obstacle, resulting the grip gave out and fell.