Ten Box Sudoku

The diagram is a toroid; some of the 3×3 regions don't end at the right (lower) edge of the diagram but continue at the left (upper) edge of the diagram.

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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Sudokus with no one can solve

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Ten Box Sudoku

Sudokus that no one can solve