Will Shortz Presents Triple Threat Sudoku: 200 Hard Puzzles: Will Shortz Presents...

Can't get enough sudoku?
Take on this collection of 200 devilishly difficult sudoku puzzles
This book is the last in the series that began with "Will Shortz Presents Single Scoop Sudoku" and "Will Shortz Presents Double Dip Sudoku."

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