Many play sudoku, but only a select few reach the pinnacle of puzzle mastery. Now, with Ninja Assassin Sudoku, you can work your way up from white-belt status all the way to the elite black belt in books that grow steadily more challenging . . . and fun. White Belt may start gently, but don"t be fooled-you will be tested in these pages. Just remember: what doesn"t kill you only makes you stronger!