Will Shortz Presents Difficult Sudoku : 200 Hard Puzzles

Are you tough enough?
Take on this collection of 200 difficult sudoku puzzles and find out!

Includes:
-200 hard puzzles
-Perfect portable size
-Edited by Will Shortz

Also in the series:
-Will Shortz Presents Daring Sudoku
-Will Shortz Presents Dangerous Sudoku

“A puzzling global phenomenon” —The Economist

“The biggest craze to hit The Times since the first crossword puzzle was published in 1935.” —The Times of London

“England's most addictive newspaper puzzle.” —New York magazine

“The latest craze in games” —BBC News

“Sudoku is dangerous stuff. Forget work and family—think papers hurled across the room and industrial-sized blobs of correction fluid. I love it!”” —The Times of London

“Sudokus are to the first decade of the 21st century what Rubik's Cube was to the 1970s.” —The Daily Telegraph

“Britain has a new addiction. Hunched over newspapers on crowded subway trains, sneaking secret peeks in the office, a puzzle-crazy nation is trying to slot numbers into small checkerboard grids.” —Associated Press

“Forget crosswords.” —The Christian Science Monitor