Absolutely Nasty Sudoku Level 4
By (Author) Frank Longo
Union Square & Co.
Sterling
1st March 2007
3rd May 2007
United States
General
Non Fiction
793.74
Paperback
160
Width 152mm, Height 229mm
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.)