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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.

            2 12 3 4   7
  11   7   12           8
10         1     6      
  8       6     10      
  4 6   10             5
        11     6   10    
    2   5     9        
1             5   12 8  
      3     10       1  
      8     12         2
12           6   11   7  
5   12 4 1 9            
Showing puzzle number: 645
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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