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Very difficult Sudoku puzzles

Here are some seriously hard puzzles that are considered to be the most difficult to solve. If you come across a very difficult puzzle please submit it to this forum.

Hardest Puzzles [General information about anything Sudoku related forum] contributed by Nivlem

This is a fairly fiendish level of difficulty for you.

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A diabolical one (re: Hardest Puzzles) contributed by Geraldine

This one is one of the hardest possible Sudokus I believe.

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