Will Shortz Presents Extreme Sudoku : 100 Challenging Puzzles

So you think you're tough enough?
This collection of puzzles was created for only bravest sudoku solvers. Many may attempt to master them but only the sharpest minds will succeed. So put your sudoku skills to the ultimate test and see if you're tough enough for these dangerously devious puzzles. But if you find yourself pulling out your hair in frustration, don't say we didn't warn you.

Features:
· 100 very challenging puzzles
· Edited by legendary New York Times crossword editor Will Shortz
· Big grids with lots of space for easy solving

“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