Will Shortz Presents Keep Calm and Sudoku on: 200 Easy to Hard Puzzles By New York Times - Paperback

When the going gets tough, the tough solve sudoku! Don't miss this collection Keep Calm and Sudoku! Features: * 200 easy to easy to hard Sudoku puzzles* Portable and perfect for solving on the go* Edited by the #1 man in American crosswords, Will Shortz