Condition: Brand New in Box eSudoku 15K Portable Game Unit The Ultimate Numerical Challenge If you`re planning a trip this summer, leave the book behind and take up a REAL challenge Sudoku, a logicbased number placement puzzle. The objective is to fill a 9amp;amp;times;9 grid so that each column, each row, and each of the nine 3amp;amp;times;3 boxes contain the digits from 1 to 9 only one time each. The puzzle setter provides a partially completed grid. If you`re up for a little brainteasing, b