Extremely Hard Sudoku: 500 Difficult Sudoku Puzzles for adults

500 Extremely Hard Sudoku Puzzles, that will make your brain sweat.

Keep your mind young and your memory sharp with the 500 Extremely hard and challenging Sudoku puzzles in this book.

Scientific research has shown that solving logic puzzles as Sudoku keeps your memory sharper and your mind younger.

NOTE TO EXPERT SUDOKU SOLVERS
Solving Sudoku journey is somehow like a cycling athletic journey, at first it is challenging and demanding then turned into enjoyment and finally racing on roads and winning the golden cup. After a while road racing becomes easy and that is the time to level up the game into more advanced mountain races.
The same applies to your Sudoku Journey, to ensure that the level of difficulty of the puzzles in this book is what you'll enjoy, a sample Puzzle is on the cover.

Specifications

• Size: 8 x 11.5 inch (large size) with softcover and paperback binding.
• Pages: 159 pages with 500 different puzzles (4 per page).
• Plus the Answers of all the puzzles at the end.
• Bonus puzzles inside: Hard Jigsaw Sudoku

Stretch your brain with this unique selection of fun and challenging Sudoku. Scroll up and order your copy.