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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.

2     12   3   1 16     13 7 14 4  
10     5 8     15   13 4     16    
15 10   4   11 13 16       9       6
  8 1   12 14 9     2 7   6     15
  4 14       15   11 8 3 5 10     12
14     10 4 9   2 13       8 15 11  
      6           3 1 11 12 2 13  
16   11   2 6       9 13 15 3 1   10
7   15 13 9 2 5       14 16   10   1
  2 6 15 13 1 16           11      
  13 7 16       6 1   10 3 14     8
12     1 16 4 7 14   15       8 3  
13     11   8 2     4 9 7   3 1  
4       10       14 16 11   2   6 3
    12     13 10   7     1 15     5
  5 8 14 1     7 4   16   9     13
Showing puzzle number: 691
Puzzletype: Symmetrical Sudoku
Startnumbers: 136
Difficulty: Hard (0)
Solution methods: SiSo SC DC
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