Pocket Sudoku Presented by Will Shortz, Volume 4 : 150 Fast, Fun Puzzles

Calling crossword enthusiasts, logic puzzle aficionados, or any lover of a good puzzle: here is the latest sensation---sudoku! New York Times crossword editor Will Shortz presents the fourth volume of Pocket Sudoku---a fun collection of 150 sudoku puzzles, ranging in difficulty from easy to challenging. Anyone can do sudoku! There's just one simple rule: Fill in the empty boxes in the nine-by-nine grid, so that every row, column, and three-by-three square contains the numbers 1 through 9, without repeating. That's it! See for yourself what all the rage is about. Once you try one sudoku, you'll want to try them all!