Nowadays Sudoku is a very popular game throughout the world and it appears in different medias, including websites, newspapers and books. There are numerous methods or algorithms to find Sudoku solutions and Sudoku generating algorithms. This paper explains possible number of valid grids in a 9*9 sudoku and developed a programming approach for solving a 9*9 sudoku puzzle and the results have been analysed in accordance with various number of clues for 9*9 sudoku.