A Per Difficulty Chart Mega Series

A Per Difficulty Chart Mega Series is a major super series that contains mega books that contains super books that contains books that contains seasons that contain clusters that contain chapters that contain stage per difficulty chart obbies that contain stages that contain obstacles. You didn't realize this is mega big.

What is it?
A Per Difficulty Chart Mega Series contains 144 stage per difficulty chart obbies. Instead of repeating every difficulty, it ascends higher to harder ones which are beyond nil. They are known to be joke difficulties, whereas some weird names and weird decals such as "Issue?", "Maximum Overdrive" and "Effortful".

This is also known to contain legendary difficulties as well, such as Supreme, Megadeath and Effortful, as the true humanly impossible difficulties. This is why this journey is meant to be "impossible" yet, which affects the whole entire series. Such as the Rebirth system, you have to really beat the whole entire series 10 times.