• Gattai is a Japanese word meaning merged or fused; this term is used for overlapping sudoku. A number after the word "Gattai" indicates how many 9 x 9 sudokus are in the puzzle .
  • Gattai-3

    Sudokus that no one can solve

    Sudokus that no one can solve, not only including Sodukus which is very difficult but also that no one trying to solve it.


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