Number Fill In Puzzle books for Adults ( Travel Size ) Challenge Your Brain With A Massive Collection of Number Fill-Ins Puzzles for Adults (1 Puzzle Per Page) Book Details: LOTS OF PUZZLES: More Than 50 Number Fill-In Puzzles with 1500+ numbers EASY ON THE EYES: 1 Puzzle Per Page, Conveniently Printed at 5" x 8". SOLUTIONS: Solutions are included at the back of the book. Number Fill-Ins Puzzle books for Adults 1 puzzle per page for easy reading. Whether you are a beginner or a pro, this book will have puzzles for you.