Will Shortz Presents Train Your Brain Sudoku: 200 Puzzles To Flex Your Mental Muscles

Watch out! These puzzles are going to make you sweat. Includes: -200 very hard puzzles-Perfect portable size-Edited by Will Shortz
Book details: Will Shortz Presents Train Your Brain Sudoku: 200 Puzzles To Flex Your Mental Muscles by author Will Shortz, Published by St. Martin'S Griffin, in Paperback binding, 320 pages, ISBN 9781250075482