Miyamoto, Tetsuya. <br/><br/>
KenKen :  the new brain-training puzzle phenomenon : book 2 / 
Tetsuya Miyamoto. 
 - Tokyo, Japan :  Gakken Co., Ltd,  c2008. 
 - xv, various paging ;  18cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental efficiency--problems, exercises, etc.<br/>Puzzle.