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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.

199516 puzzles downloaded.

  16         13 8         2      
      2 1             10     13 14
6 3 13                 8 7 4    
                            6 11
          8 9 7 12 6     15 3   13
                14 7 10 11       12
11 12 14   13   15   8              
                          10 11  
  4 5                          
              13   3   7   9 12 8
14       4 2 10 6                
3   1 15     16 14 2 8 13          
16 5                            
    3 9 16                 8 15 6
2 15     10             9 5      
      1         7 5         9  
Showing puzzle number: 338
Puzzletype: Symmetrical Sudoku
Startnumbers: 76
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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