The Penguin Sudoku Challenge
Sudoku (soo-doh-koo): a 9x9 logic puzzle to superheat the very core of your brain and to challenge your numeracy, spacial awareness and problem-solving abilities.
WARNING: the five levels of Penguin Sudoku Challenge: Volume 2 may leave you smugly grinning, scratching your head, sighing deeply, snapping your pencil - and you may even throw your book at the wall.
But you also have permission to frame your most difficult completed 9x9s.
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