Pocket Sudoku - a compact & travel-friendly puzzle book: only 4 x 6 inches in size | 5 Difficulty Levels | easy - normal - hard - very hard - extreme | 150+ Grids With Answers At The Back

by Mini Sudoku Paperback details (USA). ISBN: 978-1-6994-6354-3 ISBN-10: 1-6994-6354-9 Independently published · 2019