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See Details We use cookies to personalise content and ads. We also share information about your use of our site with our advertising partners who may combine it with other information you've provided to them or they've collected from your use of their services.
Help Read the help page on Sudoku puzzles for a more detailed explanation.
Keyboard Usage[only when your cursor is in the grid] Note: not all options work on all browsers. Ctrl + Arrows = move around the grid. a = auto-pencil marks. p = show a pinned square. Shift + # = show squares with a <#>.
Uniqueness Each puzzle has exactly one solution, which can be found using logic alone and no guesses are ever required. If you think you've found another solution, then please double check the rules.
Print Sudoku
Unique Reference = [Sudoku-20171114-Hard-159717]
Sudoku Export
This output is generated each time you click 'Export'.
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