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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.

        11   1          
  4 10 5           1   7
      6         11 4    
2             10     6 9
9 5   12           6    
        6 5       8    
    1       12 5        
    9           8   7 6
11 1     4             5
    7 2         10      
12   3           1 10 11  
          12   4        
Showing puzzle number: 559
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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