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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.

14   5 16 11 6 2   15     8   7 4  
      12     5 9 4 8     15 16    
  15       4     13     9 3 11 10 16
8         3 12 2 1   6         14
16 9 10       11     5   4   2    
      8 15 12 9   7 3 13 16 4   1 11
  11   9 14       3     10 8 5    
13 1 9 5 16       8   3   12 15   4
3   16 1   7   11       6 14 9 8 10
    6 15 5     14       3 10   11  
2 14   10 7 8 15 16   1 9 11 5      
    12   4   7     6       13 9 2
15         13   4 11 9 2         8
1 12 13 4 8     3     14       5  
    1 11     14 15 9 7     16      
  3 7   6     10   2 8 15 1 12   5
Showing puzzle number: 2557
Puzzletype: Symmetrical Sudoku
Startnumbers: 134
Difficulty: Very hard (0)
Solution methods: SiSo SC DC XW SF
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