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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.

595979 puzzles downloaded.

  6 1         2       9
8 4 2 3 6              
5     7       8        
          2 12   1   3  
      8 11     1        
            8         3
7         11            
        12     10 5      
  9   5   8 6          
        7       6     10
              9 11 2 4 12
6       4         7 9  
Showing puzzle number: 280
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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