Hashi : the addictive number puzzle 
Puzzler Media 
 - New York  HarperCollins  2006 
 - 256 p 
<br/><br/><label>ISBN: </label>9780007281589 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Puzzles
<br/><br/><label>Dewey Class. No.: </label>793.74 PUZ