Do you love solving Sudoku brain-puzzles? Which level of Sudoku you’d usually prefer? Although solving the “hard level” Sudoku puzzles can be time consuming, they are intellectually stimulating and rewarding in the end. To put it simply, hard or simple, Sudokus are fun! They have long been a great tool of mental exercise. As a member of Sudoku tribe, we should be able to solve all types of Sudoku brain-games.
This page contains a list of Sudoku books of “Extremely Hard” level, particularly suitable for the young and adults. Although kids can also try these puzzles, I have a separate list of books (easy, moderate, and hard levels) recommended for the kids.
Don’t forget to check out more Sudoku titles:
- Extremely Hard Sudoku Puzzle Books (Young & Adults)
- Mixed Sudoku Puzzle Books (Extremely Hard, Hard, Moderate & Easy)
- Moderate Level Sudoku Puzzle Books (Young & Adults)
- Sudoku Puzzle Books for Kids (Easy, Moderate, Hard)
- Sudoku Puzzle Books for Young & Adults (Easy, Moderate, Hard)
- Pocket Sudoku Puzzle Books (Level: Hard, 4 x 6 Inches in Size)
- Pocket Sudoku Puzzle Books (Level: Moderate, 4 x 6 Inches in Size)
- Mixed Pocket Sudoku Puzzle Books (Difficult, Moderate, Easy, 4 x 6 Inches in Size)
All Word Search Puzzles (Kids, Teens, Adults, and Seniors):
- Word Search Puzzles for Adults & Seniors (Level: Extremely Hard)
- Word Search Puzzle Books (Moderate Level, Teens, Adults, Seniors)
- Simple Word Search Puzzles for Kids and Teens
Here are the Sudoku puzzle books, especially designed for the enthusiastic young and adults. The books are available on my Amazon homepage and different Amazon marketplaces (.com, .uk, .ca, etc.). All books are of “Extremely Hard” level. Further, the books are available in both paperbacks and hardcovers formats. Each book contains over 200 Sudoku puzzles.
- Series on Amazon: Extremely Hard Sudoku Brain Puzzles
All Sudoku titles can be found by searching the given ISBNs in different Amazon marketplaces.
Sudoku Book 1 (Level: Extremely Hard)
Paperback (ISBN: 9781954879911) and Hardcover (ISBN: 9781954879928).
Sudoku Book 2 (Level: Extremely Hard)
Paperback (ISBN: 9781954879935) and Hardcover (ISBN: 9781954879942).
Sudoku Book 3 (Level: Extremely Hard)
Paperback (ISBN: 9781954879959) and Hardcover (ISBN: 9781954879966).
Sudoku Book 4 (Level: Extremely Hard)
Paperback (ISBN: 9781954879973) and Hardcover (ISBN: 9781954879980).
Sudoku Book 5 (Level: Extremely Hard)
Paperback (ISBN: 9781954879997) and Hardcover (ISBN: 9798887230009).
Sudoku Book 6 (Level: Extremely Hard)
Paperback (ISBN: 9798887230016) and Hardcover (ISBN: 9798887230023).
Sudoku Book 7 (Level: Extremely Hard)
Paperback (ISBN: 9798887230030) and Hardcover (ISBN: 9798887230047).
Sudoku Book 8 (Level: Extremely Hard)
Paperback (ISBN: 9798887230054) and Hardcover (ISBN: 9798887230061).
Sudoku Book 9 (Level: Extremely Hard)
Paperback (ISBN: 9798887230078 ) and Hardcover (ISBN: 9798887230085).
Sudoku Book 10 (Level: Extremely Hard)
Paperback (ISBN: 9798887230092) and Hardcover (ISBN: 9798887230108).
Sudoku Book 11 (Level: Extremely Hard)
Paperback (ISBN: 9798887230115) and Hardcover (ISBN: 9798887230122).
Sudoku Book 12 (Level: Extremely Hard)
Paperback (ISBN: 9798887230139) and Hardcover (ISBN: 9798887230146).
Sudoku Book 13 (Level: Extremely Hard)
Paperback (ISBN: 9798887230153) and Hardcover (ISBN: 9798887230160).
Sudoku Book 14 (Level: Extremely Hard)
Paperback (ISBN: 9798887230177) and Hardcover (ISBN: 9798887230184).
Sudoku Book 15 (Level: Extremely Hard)
Paperback (ISBN: 9798887230191) and Hardcover (ISBN: 9798887230207).
Sudoku Book 16 (Level: Extremely Hard)
Paperback (ISBN: 9798887230214) and Hardcover (ISBN: 9798887230221).
Sudoku Book 17 (Level: Extremely Hard)
Paperback (ISBN: 9798887230238) and Hardcover (ISBN: 9798887230276).
Sudoku Book 18 (Level: Extremely Hard)
Paperback (ISBN: 9798887230245) and Hardcover (ISBN: 9798887230283).
Sudoku Book 19 (Level: Extremely Hard)
Paperback (ISBN: 9798887230252) and Hardcover (ISBN: 9798887230290).
Sudoku Book 20 (Level: Extremely Hard)
Paperback (ISBN: 9798887230306) and Hardcover (ISBN: 9798887230313).
Sudoku Book 21 (Level: Extremely Hard)
Paperback (ISBN: 9798887230320) and Hardcover (ISBN: 9798887230375).
Sudoku Book 22 (Level: Extremely Hard)
Paperback (ISBN: 9798887230337) and Hardcover (ISBN: 9798887230382).
Sudoku Book 23 (Level: Extremely Hard)
Paperback (ISBN: 9798887230344) and Hardcover (ISBN: 9798887230399).
Sudoku Book 24 (Level: Extremely Hard)
Paperback (ISBN: 9798887230351) and Hardcover (ISBN: 9798887230405).
Sudoku Book 25 (Level: Extremely Hard)
Paperback (ISBN: 9798887230368) and Hardcover (ISBN: 9798887230412).
Sudoku Book 26 (Level: Extremely Hard)
Paperback (ISBN: 9798887230429) and Hardcover (ISBN: 9798887230474).
Sudoku Book 27 (Level: Extremely Hard)
Paperback (ISBN: 9798887230436) and Hardcover (ISBN: 9798887230481).
Sudoku Book 28 (Level: Extremely Hard)
Paperback (ISBN: 9798887230443) and Hardcover (ISBN: 9798887230498).
Sudoku Book 29 (Level: Extremely Hard)
Paperback (ISBN: 9798887230450) and Hardcover (ISBN: 9798887230504).
Sudoku Book 30 (Level: Extremely Hard)
Paperback (ISBN: 9798887230467) and Hardcover (ISBN: 9798887230511).