400 Classic Killer Sudoku 9 X 9 VERY HARD + BONUS 250 Hidoku Puzzles
Subtitle: Sudoku with VERY HARD Levels Puzzles and a Hidoku 9 X 9 Very Hard Levels
Publisher: CreateSpace Independent Publishing Platform
Published: 2018
Language: eng
Number of pages: 104
ISBN-13: 9781727269475