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Samurai Sudoku
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Sudokus with no one can solve
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Gattai-3
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Clueless Sudoku 1
Clueless Sudoku 2
Twin Corresponding Sudoku
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Butterfly Sudoku
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.
