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Sudoku puzzles (Su Doku)

My database includes 12449 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 3x5 box contains the digits 1 through 15. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

905276 puzzles downloaded.

        13 6   4 1 12       8 10
    4           7 9     3 12 13
10 1       8             4   7
            5 9     12       2
        2 11 10 1 12 3 8   13    
  9 8               10     5 1
12     6 3   14   10   13     11  
1 8 5                   12 7 15
  13     9   12   6   1 5     3
7 14     10               2 1  
    15   11 7 1 3 4 10 14        
6       5     11 8            
14   2             6       3 9
15 5 11     3 7           6    
8 10       5 4 15   1 7        
Showing puzzle number: 3665
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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