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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.

755861 puzzles downloaded.

6     9             3 5
    12     5   8   7    
    7   1       12 10   2
      7                
      2         4     6
    2   12 9     1 3 10  
  10 11 1     12 7   2    
1     4         10      
                3      
4   3 12       5   9    
    8   2   7     12    
12 5             9     7
Showing puzzle number: 31
Puzzletype: Symmetrical Sudoku
Startnumbers: 46
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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