Will Shortz Presents Treacherous Sudoku: Harder Puzzles

This book is for savvy sudoku solvers who are looking for puzzles that are harder than hard

Features:

· 200 fearsome puzzles

· Edited by legendary New York Times crossword editor Will Shortz

· Portable and affordable package

Also in the series:

-Will Shortz Presents Tough Sudoku

-Will Shortz Presents Terrifying Sudoku