A strange era has arrived, and unknown "black holes" appear in various countries and are regarded as "levels" and named "Grudge".
Every once in a while, a selected player will receive an "invitation" to go to "Grudge" to clear the level.
The level difficulty from low to high is: DCBAS.
When someone can pass the S-level level, regardless of life or death, the entire weird era will end.
Level difficulty is random.
Note: There will be a big reversal
Okay, I'm sorry. I know my writing skills are not very good now.
I will work hard
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Purpose: to save