Do you think you're a number samurai? Well then, let's test your skills Here are some extremely difficult Sudoku puzzles that you will be challenged to complete. You can solve the puzzles on your own or you can ask a friend to compete against you. Be warned, however, that these puzzles are reserved for the experts. Do you have what it takes to complete the game? | Number Samurai Sudoku Extreme Puzzles by Senor Senor Sudoku, Paperback | Indigo Chapters