It's like the author's self-masturbatory work or something, where he fellates his own self-insert for being a genius on the sole virtue of being right once and having all the answers handed to him. Because if this were an isekai/VRMMO, anyone could have just hit up the wiki or youtube for a strategy guide. No, to be special above all others, the author NEEDS his MC to conveniently receive a book that only he can read with all the answers to the game-like universe he lives in.