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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.

187371 puzzles downloaded.

2           13     7 5     14    
  6                            
  7     1 10         13       3  
13     14 6 3 5     1            
12 15 10         7               11
9 11         14   10 12 6   8   5  
        10     15 8       12 1   4
  8     5         4           13
8           15         16     12  
14   15 1       11 5     2        
  3   6   4 2 13   9         7 1
10               3         11 4 15
            1     3 8 6 9     10
  9       14         2 15     8  
                            15  
    7     15 3     14           2
Showing puzzle number: 528
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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