Go way beyond difficult, with the hardest, most brain-busting
sudoku you've ever seen! Calling all sudoku-solving diehards: with
every puzzle requiring upper-level strategies, this collection
packs even more of a punch than our previous Beyond Black Belt
Sudoku. Get ready, because you'll encounter common advanced
techniques with curious-sounding names like XYZ-Wing, Finned
X-Wing, Sashimi X-Wing, Swordfish, Jellyfish, Gordonian Rectangle,
and Gordonian Polygon. And you might find some tricky new things
here, too, from Grouped X-Cycle and Simple Grid Coloring to 3D
Medusa and Bi-Value Universal Grave. The sudoku generally become
increasingly difficult as the book goes along, from "pretty darn
hard" to "excruciating." Are you up for the challenge?
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