Definition of octagonal cage: an octagonal closed ring with an area of 750 square feet (70 square meters), surrounded by steel wire mesh and covered with black artificial leather. The diameter of the ring is 9.8m, and the height of the fence is1.8m. The whole ring is1.2m higher than the ground, and there are two doors (usually diagonal) for access. The fence and eight pillars are surrounded by foam pads. The floor is a mat printed with the logo of the sponsor or organizer. Only two players and two referees are allowed to participate in the competition, and both teams are allowed to participate between rounds.

The bottom is an octagonal cage, but it lacks a base.

You can play games. But mixed martial arts is a fighting sport with certain risks, so be prepared:

A professional referee team and linesman must have corresponding professional knowledge to deal with unexpected situations at the scene.

Corresponding emergency plans, such as first aid for athletes, fire emergency and so on.

Professional competition rules, you can refer to UFC.

Cage fighting does not mean to compete in an octagonal cage. Strictly speaking, cage fighting can be carried out in cages, but UFC uses octagonal cages, and everyone has followed suit and used octagonal cages.