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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.

207763 puzzles downloaded.

2 9         13     10   1        
      1 4   10           12     11
  8 4     1   9   12   16   10 13  
12 10 13           4   11          
  14   13         9       15   11 10
                    4   14   5  
    5   16 11             2 7    
        2               16 3    
    10 14               4        
    3 4             2 7   12    
  5   15   16                    
1 13   12       2         6   16  
          5   12           11 4 6
  1 12   10   16   7   14     9 15  
7     5           13   6 1      
        9   3     4         7 14
Showing puzzle number: 454
Puzzletype: Symmetrical Sudoku
Startnumbers: 80
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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