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Sudoku puzzles irregular (Su Doku)

My database includes 1031 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every box contains the digits 1 through 12. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

539370 puzzles downloaded.

3 12       1     5     10
  4         1       12 9
9     10             3 7
  1                    
          7         5  
4   7   6   11 9        
        2 3   7   6   12
  3         4          
                    1  
1 11             9     6
2 10       11         8  
6     3     2       10 4
Showing puzzle number: 813
Puzzletype: Symmetrical Sudoku
Startnumbers: 42
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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