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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.

6898153 puzzles downloaded.

10 1 6 16 15 11 9                 7
        16 4 6 10       13 11     8
8   4       5 7   12         9  
  13   15   8   3     11          
            12 6 13         1 5  
2 9   7 14 1   8       4   11    
16 4     2 10           12   9    
5     10       9 6 14 2     8 13 4
12 16 2     15 8 11 4       3     6
    8   6           14 2     10 5
    10   13       12   15 7 8   11 1
  7 11         4 16 8            
          9     7   13   2   3  
  11         1   10 5       6   15
3     2 7       14 6 9 1        
13                 16 12 11 5 7 1 10
Showing puzzle number: 12971
Puzzletype: Symmetrical Sudoku
Startnumbers: 108
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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