My rating system is when you see the master ball (purple and white) it is the best book in the whole world you have to get as soon as you finish reading this blog,second is the ultra ball (black,yellow,white) it is an awesome book and the best but awesome so than you should get the book,third is the great ball (blue,white) it is an okay book I don't really like it but I don't it it's okay,fourth is the poke ball ( red.,white) it is an okay book not the best as I said before now the last one the net ball ( green,white) terrible book ,the worst book, I hate, never read in your whole LIFE.