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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.

    5   4         8    
  9       1   8   6    
5   1 8       7        
4 6   11   8 10 1        
    9     5 2         7
      7         8   6  
  3   2         12      
8         9 1     10    
        12 7 9   2   11 1
        5       10 2   6
    4   6   11       5  
    11         3   5    
Showing puzzle number: 271
Puzzletype: Symmetrical Sudoku
Startnumbers: 48
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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