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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.

    11     6   7   3 12  
          1         2  
1     9       5       6
  6   11 1           3  
    8 5     11 2       1
        10 4   9        
        9   3 1        
10       12 2     6 1    
  7           10 4   6  
4       3       2     10
  2         9          
  4 2   11   1     12    
Showing puzzle number: 903
Puzzletype: Symmetrical Sudoku
Startnumbers: 46
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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