As mentioned before, the most valuable thing in an underground game is to have a sense of reason. For example, wolf fang, crocodile python, and butcher who had lost their sense of reason had thus been abandoned by the underground audience.
If they were still alive and still in a berserk state after the end of the game, they would very likely be rated as "low-level animals" by the program team and the audience, then thrown into the underground arena! The audience of the underground arena was even crazier than those watching the dark-type death games!
It was said that any rational person would turn mad within 60 seconds in the arena. What was proportional to the level of craziness was the dark coins that they could obtain.
As long as one had enough dark coins, anything, no matter how unbelievable it was, could be achieved!