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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
  6         10   12 3    
        5 4   6 2 7    
  7           8 9 1    
  3               6   9
5 2 4           10      
      9           10 2 1
9   7               8  
    6 1 3           4  
    10 2 6   1 4        
    1 12   8         11  
3                      
Showing puzzle number: 572
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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