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Sudoku puzzles (Su Doku)

My database includes 10934 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x4 box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

1549217 puzzles downloaded.

1 5     11 4   2   10   6
              7        
    2   6   3     11   8
10 8 12 6   3   5 1   7  
  4             9      
      7 4 8   11 12      
      3 7   4 9 5      
      10             1  
  1   5 12   11   6 7 9 4
9   4     7   10   5    
        5              
5   10   9   12 4     11 7
Showing puzzle number: 5398
Puzzletype: Symmetrical Sudoku
Startnumbers: 56
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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