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That’s Not a Sudoku. This is a Sudoku.

That’s Not a Sudoku. This is a Sudoku.

So you’ve played Sudoku, have you? That’s great. A Finnish mathematician named Arto Inkala has created what he believes to be the world’s hardest game of Sudoku. Give it a shot, if you like, since you’re so smart, but be forewarned. On a difficulty scale of one to five, the game comes in at eleven

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