World's Hardest Sudoku Book
Subtitle: 200 of the World's Toughest Sudoku Puzzles
Publisher: Createspace Independent Publishing Platform; CreateSpace Independent Publishing Platform
Published: May 02, 2016
Format: paperback
Number of pages: 74
ISBN-13: 9781533034182
Notes: Source title: World's Hardest Sudoku Book: 200 of the World's Toughest Sudoku Puzzles