Sudoku :  four levels of difficulty 

 - 117 pages :  Illustrations ;  21 cm 
<br/><br/><label>ISBN: </label>9781851285358 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sudoku--Juvenile literature<br/>Mathematical recreations--Juvenile literature<br/>Logic puzzles--Juvenile literature<br/>Puzzles--Juvenile literature
<br/><br/><label>Index Terms--Genre/Form: </label>--puzzles
<br/><br/><label>Dewey Class. No.: </label>793.73