The Original Sudoku: Editors of Nikoli Publishing: 0019628142153: Amazon.com: Books
Original Fun and Easy Sudoku - Penny Dell Puzzles
Original Sudoku Page-A-Day Calendar 2022: Handcrafted by the Sudoku Experts That Invented the Game: Workman Calendars, Editors at Nikoli: 9781523512164: Amazon.com: Books
Sudoku - Wikipedia
The Original Sudoku Book 2 by Editors of Nikoli Publishing | Hachette Book Group
Original Sudoku Bundle - 50 - Penny Dell Bulk Puzzles