Product Description : Go way beyond difficult with the hardest most brainbusting sudoku youve ever seenCalling all sudokusolving diehards with every puzzle requiring upperlevel strategies this collection packs even more of a punch than our previous Beyond Black Belt Sudoku Get ready because youll encounter common advanced techniques with curioussounding names like XYZWing Finned XWing Sashimi XWing Swordfish Jellyfish Gordonian Rectangle and Gordonian Polygon And you might find some tricky new things here too from Grouped XCycle and Simple Grid Coloring to 3D Medusa and BiValue 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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