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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.

276535 puzzles downloaded.

9 14     16 3     7 2     11 4 10 6
7   10   8       2 12     9     14
  5   9   13 1     8 7       16 12
  12   3 10 16 2 5       15 6      
8 16   15 2 1       13   6     11 10
    11   3 15     9     10 7   2  
2 1   13   8   11     5   10 12    
  10 7 2 15 4 3   13 14   12   5   8
14   13   4   10 7   1 9 11 5 8 6  
    4 14   6     10   15   13   3 1
  13   5 1     3     14 7   2    
1 2     9   6       10 8 16   13 7
      4 6       16 7 1 5 14   8  
3 6       5 9     10 11   2   1  
16     10     12 15       3   13   11
5 8 15 1     14 9     3 16     7 2
Showing puzzle number: 1521
Puzzletype: Symmetrical Sudoku
Startnumbers: 136
Difficulty: Harder (0)
Solution methods: SiSo SC DC XW
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