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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.

7488024 puzzles downloaded.

6 3     13   15 11       2       16
13 9     4 6 2 10 16 12     7     15
        9     7   13 8          
15   14   5 12             1 8 2  
    1 7 6 2   9 4              
14 16             11         1    
9     15       12   6   14   2 4  
        3 13 11   12   7     10 15  
  12 4     3   2   15 10 13        
  7 8   11   10   5       4     2
    10         4             6 11
              1 9   12 11 10 13    
  6 15 5             4 8   7   12
          4 5   1     16        
10     2     1 6 13 7 9 12     14 4
4       10       14 5   15     9 8
Showing puzzle number: 14632
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Very hard (0)
Solution methods: SiSo SC SB DC SF
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