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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.

100837368 puzzles downloaded.

              4 1
    7 9          
    5     2      
  7              
8   1       3 7  
  9   2   8 4    
      4   1 9 8  
    4   6     3  
1 3              
Showing puzzle number: 6672150
Puzzletype: Optimal Sudoku
Startnumbers: 24
Difficulty: Super hard (31)
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