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Submission + - The 10 World's Hardest Logic/Number Puzzles

dr_blurb writes: If you like your logic and number puzzles to be of the harder variety,
check out "The 10 Hardest Logic/Number Puzzles": we've tried to identify
the World's hardest puzzles in categories like Sudoku, Kakuro, and chess.
There are 9 on the page so far, so your suggestions are needed for the
10th entry. And what is it that makes these puzzles so difficult?
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The 10 World's Hardest Logic/Number Puzzles

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