The competition ring of the Challenge main hall was called the challenge ring. The rules of the ring were simple. Basically, it was a place to battle and receive constant challenges. The winner would receive a generous reward.
Every ring would be open for people to challenge. Even if there was nobody else inside, a challenge was still possible. When challenging an empty ring, one had to put down a minimum of 1,000 Contribution Credits as the challenge fee. Then, the person could proceed to the ring and begin the challenge.
The first three rounds were not challenges against people. Instead, they were battles of physical energy via stratagem techniques.
The first round of the battle of physical energy was equally matched to the ability of the challenger. The second one would have a stronger physical energy and difficulty level appearing.