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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.

4     12 16 15     8       11 10    
11 9   13 1     4 16     7   14   6
6 10 11 15     4   1 16         5 13
5 6       8 14 13 12 2 10   7 16    
  2 4 10   16   7 9 11       12 15  
  12 15 7   4           16 13      
8   10   11 7 15       16         3
9     16 8   11   10 1 2 15 12 3 14  
  11 3 2 9 5 16 15   7   14 10     12
16         12       3 4 9   6   11
      11 3           13   14 4 2  
  7 1       2 16 4   15   6 11 8  
    14 8   6 7 3 13 5 11       9 1
3 15         1 10   8     5 9 13 7
10   8   12     11 15     6 1   16 9
    12 3       9     7 13 16     2
Showing puzzle number: 2159
Puzzletype: Symmetrical Sudoku
Startnumbers: 136
Difficulty: Hard (0)
Solution methods: SiSo SC DC
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