Gould, Wayne <br/><br/>
Extreme su doku : the ultimate su doku challenge 2 
Wayne Gould 
 - London  HarperCollins Publishers  2007 
 - xxxiii, 120 p. ; 23 cm 
<br/><br/><label>ISBN: </label>9780007263707 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical puzzles<br/>Sudoku
<br/><br/><label>Dewey Class. No.: </label>793.74 GOU