Capítulo 138: True Library Expedition VI: Hall Of Riddles

I was first to solve it. The Librarian spoke again, and it seemed this time I was the only one who could hear them. "Before you go on, I should explain the Hall Of Riddles. It's basically a collection of what I see as the best puzzles I ever made. The great door to the final test to access the Library's Special Collection will only open for someone who possesses at least one Special Collection Library Key, like yourself. And then, of course, only after you solve all the puzzles.

However, anyone who gets this far is welcome to try the puzzles anyway. In fact, your sect requires elders to solve them as a prerequisite to test to promote to Grand Elder.

I'll be waiting for you all in the Special Collection. Best of luck."