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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.

6898538 puzzles downloaded.

        15   2 6 7     10       16
16             8   15 3 2   14 1  
3   6           5 12   4   7    
      12   5         6 1 8   10  
2     15   10     13 3 14       11  
  5 9       14 15 10         16 7  
    4   8 11 7 9     2   12   15  
  12         1 16       11     9  
  10     7       3 6         8  
  14   1   8     9 4 7 12   2    
  13 15         2 14 1       11 6  
  7       9 13 3     10   15     5
  11   5 2 3         1   6      
    1   13   8 7           10   12
  6 12   16 1 11   8             2
13       12     10 4 9   7        
Showing puzzle number: 6469
Puzzletype: Symmetrical Sudoku
Startnumbers: 104
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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