Absolutely Nasty® Sudoku Level 4 by Frank Longo

Absolutely Nasty® Sudoku Level 4

Frank Longo

160 pages first pub 2007 (editions)

challenging informative medium-paced
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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.)

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