1, the book feels bad:

When you buy it, touch the word "Charles IX" on the cover. If it is genuine, it feels concave and convex. Pirates are generally straight men.

2, book printing quality differences:

It depends on whether the printing inside is clear. Charles IX's articles are in bold type. When you buy Charles IX, you will get a puzzle card. Without the decryption card, you will be a little unable to understand the contents of the book.

3, the difference of production difficulty:

Because its decryption card and puzzle area also need to be printed, if it is pirated, even if there are some selfish businesses, they will not do piracy in Charles IX, because it is difficult to copy in Charles IX, and the publishing house has painstakingly made decryption cards and puzzle areas, so selfish businesses will not spend so much money to print a Charles IX.

Extended data:

Duoduo Mo, the hero of this book, is a lame pupil. He dreams of becoming an adventurer and detective. He received a gift from his grandfather on his birthday. This is a dog of royal descent with a long history. Its name is Charles IX.

But it seems that this is not a simple dog, unexpected troubles follow, and great secrets of good and evil are unfolding. Cracking the code, tracking the footprints, analyzing and reasoning, Duoduo Mo (Dodomo), Tiny Rao, Tiger Shark (Hu Sha) and Fu You, four friends, are fearless and have cracked one maze and case after another.