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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.

515082 puzzles downloaded.

6     5 11     1        
7       6           4  
8           11 9 10      
2     10         3   6 11
              4 1 8 3 7
  12               7    
    11               12  
12 7 8 1 4              
1 2   11         12     4
      6 7 11           3
  4           11       10
        3     10 2     5
Showing puzzle number: 1023
Puzzletype: Symmetrical Sudoku
Startnumbers: 46
Difficulty: Hard (0)
Solution methods: SiSo SC SB DC
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