It is a fight of 1vs1.
You are in the teleporter at the same time and fight in a central dome.
There are two stages, and there is a large stage and dome-shaped stage.
When you win, I can change a stage.
I can watch a game of it.

When the method shoots the switch which comes out when I defeated an enemy, a new stage comes out.
A switch leaves the dome around. In the large stage, a switch comes out to the window.