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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.

7335882 puzzles downloaded.

      4       1   5 3   9   8 16
5 7   13       2 15 9   4   14 10  
  15   8       12         3 7   13
    9   7 13 15 16     14     2 12 5
  12     6 11 13       1 10 5     2
  14   3 5 7         4       11  
          15 3     12   2 7     14
  5     1 16   14 7 15           10
11           7 13 3   6 16     1  
4     9 11   16     10 2          
  8       4         7 14 15   2  
12     7 2 14       11 5 15     9  
14 9 2     8     11 1 13 5   12    
15   3 12         4       14   7  
  11 6   13   14 15 2       1   16 4
7 4   16   6 1   8       2      
Showing puzzle number: 7521
Puzzletype: Symmetrical Sudoku
Startnumbers: 116
Difficulty: Super easy (0)
Solution methods: SiSo
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