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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.

275659 puzzles downloaded.

            11   13       8     9
8 6   4 7           11         15
    16 2         15 9            
        16 3 12     7 14       4  
    7 8 9       16   3   14     4
13     12           14            
10 14 11   5             13 3 16    
1                             7
4                             16
    13 7 2             10   8 1 5
            8           4     14
6     16   5   1       14 13 10    
  10       14 9     3 16 6        
            7 2         6 3    
16         4           15 1   5 10
15     6       12   1            
Showing puzzle number: 601
Puzzletype: Symmetrical Sudoku
Startnumbers: 78
Difficulty: Easy (0)
Solution methods: SiSo SC SB
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