Third Degree Green Belt Sudoku R
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Way Beyond Black Belt Sudoku®
With every puzzle requiring upper-level strategies, this collection packs even more of a punch than Beyond Black Belt Sudoku. You'll encounter common advanced techniques with curious-sounding names like Sashimi X-Wing, Swordfish, and Gordonian Polygon, as well as some tricky new things, including Grouped X-Cycle and 3D Medusa. The puzzles grow increasingly difficult as the book goes along, from "pretty darn hard" to "excruciating."
Absolutely Nasty® Sudoku Level 2
Even more interaction--this time used in combination with other procedures...and a lot more heavily than in the first book.