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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.

              4   1    
2   4     10       3    
4   6 1 3 9     12      
6     8           5    
      9   11 1 12     4  
12 9           5        
        4           2 6
  12     2 1 11   7      
    8           11     10
      4     5 6 3 8   9
    3       10     2   12
    1   8              
Showing puzzle number: 580
Puzzletype: Symmetrical Sudoku
Startnumbers: 46
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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