When you're serious about playing Sudoku, you need to start investing in techniques. To do that, get some research done and have some puzzles to solve. This Sudoku puzzle book offers a unique learning experience because the puzzles' difficulty change at random. You could be applying your new technique on easy puzzles one moment and on difficult puzzles next. Get a copy today. | Sudoku Techniques for the Serious Players by Senor Senor Sudoku, Paperback | Indigo Chapters