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Sudoku puzzles 4x4 (Su Doku)

My database includes 34183 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 4x4 box contains the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

    7         2   10 13     9   12
12 1       10 3     2 14 9   16   15
  14   13         16   8     10 2 4
5 16       8       15 7     13    
  15 6             14            
7 13   5         6 12 1   16   4 2
        11       7 16 3 2 14      
  12 8       6 13       4 7      
      14 7       1 8       2 12  
      4 8 11 2 14       3        
10 8   2   6 15 3         11   1 9
            16             14 8  
    15     3 9       10       11 1
8 5 9     13   6         2   10  
4   10   2 14 1     13 9       6 16
13   12     4 7   2         8    
Showing puzzle number: 32639
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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