Absolutely Nasty Sudoku 4 - Challenging Puzzle Book for Adults | Brain Teaser & Logic Games | Perfect for Travel, Commute & Relaxation
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DESCRIPTION
Top solvers can try their hand at the One-Sided Gordonian Rectangle; Extended Gordonian Rectangle; Gordonian Polygon; and Alternating Digits. (But they can take comfort in knowing that no more than one will occur in any single puzzle.)