Number search puzzles train memory and concentration. This book has an easy level of difficulty (numbers with 4-6 digits) and is therefore suitable for beginners or people who prefer shorter numbers. Features of the book: 100 Number search puzzles in Large print (font size 20) 3000 hidden numbers Increasing level of difficulty Numbers are four to six digits long Search directions: horizontal, vertical and diagonal Solutions at the end of the book (font size 12)