The Jumbo Book of Killer Sudoku — Intermediate to Hard - Puzzle Genius

Largest Sudoku Puzzle Book for Adults -- 2020 Gift Ideas - 800+ Easy to Hard Puzzles to Stay sharp and have Fun, Relax and enjoy solving these 800+

Jumbo Sudoku Puzzle Book For Adults (Vol. 2): 800+ Sudoku Puzzles Medium - Hard: Difficulty Medium - Hard Sudoku Puzzle Books for Adults Including

Extra tricky. Extra tough. It's the sudoku collection that's not for the faint of heart. If you're craving the challenge, sharpen your pencil and pit

Genius-Level Sudoku: Over 300 Super-Difficult Puzzles from the Japanese Masters Who Invented the Game

Hobbies, quiz books & games

The Top 500 NES Homebrews, Vol. 6 - by Seth Abramson

Is there a limit to how many people can solve a very difficult sudoku puzzle? - Quora

Large Print Sudoku Puzzles Book 3, Adults Activity Books Large Print Sudoku - Shop Online for Books in New Zealand

300+ Large Print Sudoku Puzzles Easy to Hard: Suduko Puzzle Books For Adults With Easy, Medium & Hard Difficulty Levels And Solutions - Magers & Quinn Booksellers

The Times Fiendish Su Doku Book 17: 200 challenging Su Doku puzzles (The Times Su Doku) - The Times Mind Games - Paperback

The Jumbo Book of Killer Sudoku — by Linklater, Felix

Killer Sudoku books

Rex Parker Does the NYT Crossword Puzzle: MONDAY, Oct. 6, 2008 - Patrick Blindauer (What gave the Hulk his powers / Yokohama drama / It led to a 1773 Boston party)

The 7 1/2 Deaths of Evelyn Hardcastle by Stuart Turton

6 Advanced Sudoku Strategies explained