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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 12 16 7 8       3 13   15   9 11
2   16 6       14 3 15         1  
      1 10     8         13 6 16 9
11 6   15 2   8 5   4 3 13 12   14 16
  15         4 16 5 11   9 14      
14   11 8 15       7 5   1 2 4 6  
8     11 16 10     14 7            
6 13 9     12 16   2 10 1 4       8
16       8 4 7 2   1 15     14 3 12
            15 4     6 2 8     3
  9 2 5 13   3 7       6 1 11   15
      4 3   10 1 15 8         2  
12 2   13 4 7 11   6 9   14 3   15 1
3 11 15 9         10     7 16      
  10         1 11 9       5 15   2
5 1   7   15 14       4 3 11 2 13  
Showing puzzle number: 140
Puzzletype: Symmetrical Sudoku
Startnumbers: 138
Difficulty: Hard (0)
Solution methods: SiSo SC DC
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