You can create, play, print,and solve Sudoku puzzles. Sudoku 9981 has unlimited puzzles for you to play, or you can copy puzzles from newspapers and magazines. You can also open many more grids from the Internet. The program will help you out when you get stuck as some of the features included are: automatically generate possible number notes; solve puzzle; highlight where you went wrong.Comprise function of displaying Singles Candidature.Most hard puzzles.