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Sudoku puzzles (Su Doku)

My database includes 6913752 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

40998230 puzzles downloaded.

1     8   2   3 9
            2    
9     5         8
7               3
      4 3 5   1  
                6
6   9     1     2
    4            
  3       6      
Showing puzzle number: 6913467
Puzzletype: Optimal Sudoku
Startnumbers: 23
Difficulty: Super hard (1343)
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