Will Shortz Presents Keep Calm and Sudoku On : 200 Easy to Hard Puzzles

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

“[Will Shortz] is the crossword king.” —Steve Kroft, 60 Minutes

“The prince of crossword puzzlers.” —Greenwich Magazine

“The Riddler's got nothing on Will Shortz.” —Time Out New York

“Will Shortz is [the crossword book world's] John Grisham.” —Martin Arnold