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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.

509316 puzzles downloaded.

        4     9 1      
  8       5     3     12
    2     12         9 6
    3   11   6       10 1
        1     11        
          6   8     7  
  6     9   1          
        3     6        
12 7       9   2   4    
9 3         12     6    
1     8     9       5  
      2 10     4        
Showing puzzle number: 996
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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