Not trying to start anything, but it's a view of their hierarchy, alluding to just how evil they all are (think Epstein Island worship of 4 princes of hell/Egyptian gods/cardinal directions), and the true depth of importance of what is really happening in the world as we speak.
Day of days: Milestone or a day of most importance.
Game over: They've lost already. What we're going through is what is necessary to wake the public to the truth.
Screenshots for reference.
SS #1: Anon asks if P = Pope, and Q clarifies [Pope] has his own killbox (distinction made). P is not Pope.
SS #2: Here's where it can be confusing. "Chair" in this sense is often thought of as being the "Chair of St. Peter". The Roths own the Catholic church; that's what Q is showing. If "Chair" in this sense is the Chair of St. Peter, then it means that chair serves the Master; Satan (or someone in the Roths family that would be the actual representation of that person "pulling all the strings all around the world"). Gets a little more complicated with screenshot #3, though.
SS #3: Here, it is very clear what was really going on on the Island was some form of ancient worship of gods (includes sex, sacrifice, cannibalism, and other things). Anons have argued what makes most sense is this goes all the way back to Egyptian mythology/worship. It would not be too much of a stretch, then, to say P = Pharoah. That would help make sense of the "covered in gold" (to be though of as a god) comments from Q, also.
This doesn't answer what "C" is. It also doesn't answer what 'H' is, either.