700+ SUDOKU HARD PUZZLES: Sudoku Extremely Hard: Diabolical, Expert and Killer Puzzles
Book on Amazon
About Author
Michael Grindle

The author has always been a true Sudoku passionate and his mission is to create realities like this that can make as many people as possible to fall in love with Sudoku.

Client
Michael Grindle
Date
June 3, 2021
Services
Book Publishing