The Dangerous Book of Sudoku

You think you can handle it? Only for the bravest sudoku solvers, this collection contains 100 fiendish Sudoku puzzles!Put your sudoku skills to the ultimate test and see if you're tough enough for these dangerously devilish puzzles.Features:- 100 challenging puzzles- Edited by legendary New York Times crossword editor Will Shortz- Big grids with lots of space for easy solving