Sudoku is one of the most popular puzzle games of all time. The goal of Sudoku is to fill a 9×9 grid with numbers so that each row, column and 3×3 section Exercise your visual scanning and processing powers and strengthen your brain. With three difficulty levels, Sudoku Hard is a new version of Sudoku which is the hottest game in japan! lean into the screen and get ready to a challenging puzzle. How to Solve a Sudoku Game?: Fill the grid with your keyboard so that every row, column and 3×3 box contains the digits 1 to 9, without repeating. No need for a pencil with the best free online Sudoku. Test your skills now! Sudoku Hard ,Play free sudoku puzzles online/offline hard challenge and big win.