Warning: this Sudoku book is not for the short-tempered.
Good luck.
Combined, these should encourage you to continue playing.
There are several benefits of the game as well.
Playing improves your number skills, concentration power and logical thinking skills too.
But despite that, you should work Hard to get all the benefits of the activity.
The patterns are more difficult to catch so losing your cool is a near possibility.
Warning: this Sudoku book is not for the short-tempered