Difficult Sudoku game is suitable for those who have already played Sudoku puzzle games more than once and became a real winner of easy and classic modes. This is a hard Sudoku game in which the puzzles will be quite difficult in your solution. Moreover, you will have to prove that you are the smartest of all the players in this wonderful game. Here almost all the cells will be empty, numbers will be less and less. But you will have a lot of time to fill in the missing numbers in the cells because there aren’t time limits. Complete the game by winning it!