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Sudoku puzzles irregular and disjoint groups (Su Doku)

My database includes 1073 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 4. The cells with the same color must also contain the digits 1 through 4. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

93021 puzzles downloaded.

       
    2 1
3 4    
       
Showing puzzle number: 549
Puzzletype: Symmetrical Sudoku
Startnumbers: 4
Difficulty: Super easy (0)
Solution methods: SiSo
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