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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.

135377182 puzzles downloaded.

  5     8       9
        3     6  
8   9   4     2  
  6       5     3
  1       3 5 4  
      8       7 2
1           2    
    6   5        
    7     9      
Showing puzzle number: 6441590
Puzzletype: Optimal Sudoku
Startnumbers: 25
Difficulty: Super hard (76)
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