What does it refer to?

Mysterious occurrences loom; the entire world dramatically changes.
The fate of individuals and nations becomes bound to AnalogHorror (rule kaidan), and once the chosen of destiny fail, it means countless people in their corresponding nation will be slaughtered by the strange phenomena.
The entire world falls into unrest, panic, and despair.
Until an absolutely unexpected individual joins the AnalogHorror game.
Xiao Yiwang glanced at the weird world before him and then at the examination admission ticket in his hand.
"Have middle school entrance exams always been this complicated? Well, it does prove my intelligence!"
"I am retarded, but selected to join the analoghorror game?!"

Chapter 181 Combat Power System