Su Doku--straight from its country of origin! This pocket-sized collection contains two hundred of the wildly popular Japanese number puzzles. Some of them come in the classic format--a grid that's 9x9, broken up into nine 3x3 boxes. Others feature complex and original formations, including X Sudoku, W Sudoku, and 4-layered Sudoku puzzles, designed to challenge the more experienced solver. With puzzles that range from easy to brainbusting, everyone...