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Sudoku puzzles disjoint groups(Su Doku)

My database includes 2383 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 2x2 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.

98145 puzzles downloaded.

      4
  1 3  
  3 4  
1      
Showing puzzle number: 978
Puzzletype: Symmetrical Sudoku
Startnumbers: 6
Difficulty: Super easy (0)
Solution methods: SiSo
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