5253180
9781402743986
The difficulty level soars, as even more tricks get added to the mix: X-Wing; Swordfish; XY-Wing; XYZ-Wing; and the Gordonian Rectangle.Longo, Frank is the author of 'Mensa Absolutely Nasty Sudoku Level 3 ', published 2007 under ISBN 9781402743986 and ISBN 140274398X.
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