Absolutely NastyŽ Sudoku Level 4
, by Longo, Frank- ISBN: 9781402743993 | 1402743998
- Cover: Spiral Bound
- Copyright: 3/1/2007
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.)



