If you love number-based puzzles, this book will challenge you and provide hours of entertainment. Number fill-ins are solved through logic and process of elimination (no math involved), and are great for improving your powers of concentration.

• Includes over 80 puzzles.
• Puzzle grid on left page and number list on right, for plenty of room to work the puzzles.
• Includes answer key in the back of the book.
• Spiral-bound, 192 pages.