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Samurai Sudoku
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Sudokus with no one can solve
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Clueless Sudoku 1
Clueless Sudoku 2
Twin Corresponding Sudoku
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Clueless Sudoku 2
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.
