Sudoku Challenge Express: PORTABLE SUDOKU PUZZLE BOOK - 640 Progressively Challenging Puzzles ranging from Easy - Medium - Hard - Very Hard.

By Pocket Ninja

Master your MIND. Workout your BRAIN.

640 Challenging Math Puzzles in medium sized Sudoku Book. Printed with large numbers for easy readability. Four levels of difficulty to give your brain a challenging workout. Six puzzles per page with solutions printed at the end of each section.
- 160 EASY: for proper Brain warm-up- 160 MEDIUM: stimulation of the Prefrontal Cortex- 160 HARD: CRUSH IT
- 160 VERY HARD:

• Format: Paperback
• Language: English
• ISBN: 1692079158
• ISBN13: 9781692079154
• Release Date: September 2019
• Publisher: Independently Published
• Length: 148 Pages
• Weight: 0.46 lbs.
• Dimensions: 0.3" x 6.0" x 9.0"