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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.

188549 puzzles downloaded.

8   4 2       14 7   3 16       11
                8   10   3 6    
                      12 7   16 15
16       12           11 6   2 14 4
    16 3 1   13       7       12  
15 9       2   10       3        
  10   14       3   1 13   16 9    
1             16 9             3
2             15 10             6
    14 6   3 2   11       1   15  
        6       15   2       11 13
  4       14       16   13 10 8    
6 14 8   16 9           7       12
9 1   16 7                      
    12 5   8   6                
7       4 12   5 13       15 1   9
Showing puzzle number: 220
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Super easy (0)
Solution methods: SiSo
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