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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.

503168 puzzles downloaded.

              4        
  9         4   7     2
        8   2          
7     12   9         10 8
    10   5 4       6 11  
    1 5 12         9    
    3         2 12 5    
  10 9       6 3   1    
6 1         12   3     9
          1   9        
11     6   2         3  
        1              
Showing puzzle number: 573
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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