5253181
9781402743993
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.)Longo, Frank is the author of 'Mensa Absolutely Nasty Sudoku Level 4 ', published 2007 under ISBN 9781402743993 and ISBN 1402743998.
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