Absolutely Nasty® Sudoku Level 3:

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Author:
Longo, Frank
Number of Pages:
160
ISBN-13:
9781402743986
ISBN-10:
140274398X
Binding:
Wire Coil/Wire Comb
Publication Date:
03/01/2007
Publisher:
Puzzlewright
Absolutely Nasty® Sudoku Level 3:  - ISBN: 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.