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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.

870354 puzzles downloaded.

3     12           15   4     10
4       6 1         2   3 9  
  9 10 14     6       7 15 1    
  12   6   5 4   11       7    
13 3     8 7 12                
        4   15     6     10 8  
    12   5 9 10 14 6   15     3 1
8           13   1           12
10 7     1   8 3 15 5 13   4    
  2 6     14     5   8        
                9 12 5     2 14
    11       7   10 2   12   1  
    14 8 7       12     2 15 13  
  15 3   9         8 14       6
12     2   15           7     8
Showing puzzle number: 8880
Puzzletype: Symmetrical Sudoku
Startnumbers: 90
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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