Ninja Assassin Sudoku: Yellow Belt

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!