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Sudoku puzzles (Su Doku)

My database includes 2967 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row and every column contains the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

404194 puzzles downloaded.

9 11   2   15     6     1 8 13 3  
6       1 12     3 14   9   10 8 7
      13 4       7   6 10 1 16    
10   15 8 5 6 1   2       14 7   12
              6 13 5 7   15 3 12 16
    16   13   11   1 10 3 6 4 2    
12   14       15 4 11 8     6     1
  8         9   10       3 12 4 13
1 5 7 15       11   12         2  
13     3     4 14 16 11       9   15
    6 5 7 14 2 3   4   8   1    
15 3 13 1   5 16 7 8              
5   9 7       16   2 11 12 13 15   8
    2 6 15 9   8       4 7      
14 9 1   8   5 13     15 3       2
  6 4 16 2     1     14   11   10 3
Showing puzzle number: 1559
Puzzletype: Symmetrical Sudoku
Startnumbers: 134
Difficulty: Harder (0)
Solution methods: SiSo SC DC XW
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