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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.

401180 puzzles downloaded.

          7   15 2 10 9     3 13  
16     15 1 14 6 2   3     8 4 9  
    10 9 4 2   13 5 16 3 14 11     12
4   6 14 8       1 15       2 12  
6 8 7 3   1 14           15   11 13
8 15   10 9     14             5  
      13           4 10     15   5
1     6   15 4 7 10   14 12 5   3 9
13 7   8 12 4   11 16 14 1   10     3
11   15     13 3           2      
  2             9     15 6   7 11
3 4   5           1 12   14 8 16 6
  3 9       12 16       8 1 6   14
2     4 14 5 1 8 15   6 13 16 9    
  9 14 7     13   11 2 5 16 4     15
  11 5     9 16 12 3   2          
Showing puzzle number: 2704
Puzzletype: Symmetrical Sudoku
Startnumbers: 134
Difficulty: Hard (0)
Solution methods: SiSo SC DC
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