How to play sudoku

Fill in the entire grid so that each digit in the range 1-9 appears exactly once in each row, column, and box.

How to fill the grid

It's easy! Simply click on a square. It should be highlighted gray. Now, hit the corresponding number key on your keyboard.

To remove a mistake, select the square by clicking on it and hit delete.

  2              
9     3          
5 6   1 9   7   8
7     2 3     1  
4     7   8     9
  5     4 1     7
8   7   1 3   6 2
          4     5
              4  

Puzzle #80

Difficulty: Very Hard

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