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Sudoku puzzles disjoint groups (Su Doku)

My database includes 656 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. The cells with the same color must also contain the digits 1 through 16. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

214451 puzzles downloaded.

  7                            
11         1     12     8   15   7
8 3 14     5       1 4         16
      5 4 7 6                  
        16 3 7             5   11
14 11                   16     9 1
5     2             11 4 3 6    
7       9 2   10           4   13
1   11           9   8 15       14
    5 14 6 9             15     2
4 2     1                   13 3
6   9             13 2 7        
                  9 16 10 8      
9         10 1       12     14 7 6
10   8   12     9     6         15
                            4  
Showing puzzle number: 75
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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