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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.

653886 puzzles downloaded.

4   12 1   8   11 9      
      12       7        
      7 9 12           3
    9   6 1 12         4
9     3                
    11         10 1      
      5 2         8    
                6     8
6         3 8 4   7    
3           4 8 12      
        4       7      
      6 12   10   2 4   11
Showing puzzle number: 848
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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