A book’s rank reflects the player’s efficiency in completing all the locations of a particular book. The book cover changes along with the rank.
There are a total of 8 ranks:
I — Student
II — Bachelor
III — Graduate Student
IV — Master
V — Science Candidate
VI — Science Doctor
VII — Professor
VIII — Academician.
Rewards for rank advancement include coins and experience, as well as a more colorful book in the Library.