Not bad as a hobby!

This book points to connect is not bad at all to pass the time. But as some reviews say, it is true that we need good eyes because the numbers are written small and clear. If you have a magnifying glass with you, it may help. Otherwise, the other big issue for me is the design of the book, namely that we can not properly open and must be used as a rule, it is not practical at all. So, I removed all the pages of the book itself, and I put them all in a pocket. So I chose my design and I can put it flat on the table.