First Sudoku Book 4x4 : 
Subtitle: 100 Sudoku Puzzles Including 4x4 with Letters Coloring, Sudoku for Beginners 4,5,6,7 Years ,the Small Book of Kindergarten Sudoku with Solutions, Gift Idea for Children
Publisher: Independently Published
Published: 2020
Language: eng
ISBN-13: 9798562567420