400 Classic Sudoku 9 X 9 VERY HARD LEVELS + BONUS 250 Labyrinth Puzzles
Subtitle: Sudoku with VERY HARD Level Puzzles and a Labyrinth 21 X 21 Very Hard Levels
Publisher: CreateSpace Independent Publishing Platform
Published: 2018
Language: eng
Number of pages: 104
ISBN-13: 9781727228700