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Sudoku puzzles irregular (Su Doku)

My database includes 1031 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

756740 puzzles downloaded.

        6           2 5
  9                    
1     7 11   3   12     9
    11   10           8  
  12     9   8          
  10   8   1       9 12 4
10 8 9       6   4   7  
          3   9     5  
  5           4   7    
6     5   10   3 11     8
                    4  
3 7           1        
Showing puzzle number: 446
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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