The back cover was different from the front; it was as thick as four or five sheets of paper.
There were many small pits of varying depths on it. Could it be braille?
No, braille has a raised texture, but this back cover only had indents, no raised parts.
Interesting, there must be a secret hidden here.
Rebirth: I Turned Spider Man Into an Executioner
Sci-fi / Mature
LitRPG: My Unique Talent Is Fate Hints
LitRPG / Adventure
LitRPG: Every Attack Gives 1 Permanent HP
LitRPG / Sci-fi
Global Stat Points: I Maxed Out Attack Speed
LitRPG / Urban
LitRPG: I became the God of Mining
LitRPG / Xuanhuan
After the World Became a Game I Chose Black Talent
LitRPG / Mature
Myth Invasion: I Kill Gods on Earth
Urban / Comedy
God-level Assassin, I'm the Shadow
LitRPG / Urban
Global Panic: The Gnoll That Farmed the World
LitRPG / Urban