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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.

135786477 puzzles downloaded.

    6     5     2
9     1   2 7   6
8 2              
      2   7     1
    5 6          
    7 5 8   6    
3   8       1    
7               9
      3     4    
Showing puzzle number: 5752558
Puzzletype: Optimal Sudoku
Startnumbers: 26
Difficulty: Super hard (170)
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