Mensa Absolutely Nasty Sudoku Level #3, by Frank Longo
- ISBN: 9781402743986 | 140274398X
- Cover: Spiral Bound
- Copyright: 3/1/2007
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The difficulty level soars, as even more tricks get added to the mix: X-Wing; Swordfish; XY-Wing; XYZ-Wing; and the Gordonian Rectangle.