shitpost PPCave, I have zero idea what to do? Any help?

[Bobby]

Hello, I haven't played on these servers since I was a kid; but last week the memory of trying to solve something about the "PPCave" popped into my head at work. I hopped on the main server and began following the steps as listed on the forums; The pictures ahead will detail what I've found, as well as my confusions.

This was the most immediate thing I could find upon being inside the cave. on other posts, I have been made aware of the existence of both the letters B and C elsewhere on the map; however, I am yet to find them

Following, is the donator room. I found this through a reddit post, and apparently the first step from "/amisniper" used to be here?

I have zero clue what "9Square" is or how to become a "regular"? (apparently has something to do with playtime)
The other thread on this ended because the dude asking questions got banned. zero clue where to go, any help?

 

[Kwas]

http://nhs.tf/ppc

 

[Bobby]

http://nhs.tf/ppc

I’ve been looking at that page for the last few hours, hasn’t been much of a help. The commands posted in other posts require me to be a “regular”, the time required to become a “regular” is apparently not public, do you think you could give me a little boost by telling me where 9square is?