Free Online Sudoku Puzzle
Today i played online sudoku game which is free at Web Sudoku. There are billions of free sudoku puzzles for you to play on this website. You will never finish to play them. 
At first, i thought it is so easy to solve it but actually it is not. Maybe i am new to sudoku puzzle. Anyway, i spent 16 minutes to solve it. Please tell me how many minutes do you use to play sudoku puzzle.