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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.

707643 puzzles downloaded.

  10   2 4           3 9
11         7         2  
              3 6 1   8
      3 10     2   6   4
      10                
9   6   3   8          
          4   9   12   6
                1      
12   4   11     10 3      
2   10 7 6              
  11         12         3
6 8           4 11   9  
Showing puzzle number: 438
Puzzletype: Symmetrical Sudoku
Startnumbers: 44
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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