100 pages of two pictures that seemingly are identical are presented on the same page, but subtle changes have been made between the pictures. It's up to you to find what has been altered. - Variety of puzzle types and difficulty - Can't find all the changes? Solutions to all the puzzles are provided in the back of the book. - 100 interesting picture puzzles - each with a range of 9 to 14 differences to find. - Each puzzle is designed to keep your vision sharp and help improve memory and focus - Great adult gift for birthdays, holidays, and travel! Made to challenge your powers of observation and stimulate your ability to focus and concentrate. HOW TO DOWNLOAD 1 - Once you purchase the item, you’ll get an email with the link to the download from Etsy (or you can find the download link in your Etsy orders section on your desktop computer). 2 - Open the PDF (1 PDF with all 20 pages) in your favorite reader (Download Acrobat Reader for free at https://get.adobe.com/reader/). 3 - Print on your home computer or at a copy shop IMPORTANT DETAILS - This is an instant download. You will not receive anything in the mail. - These files are NOT editable PDFs. We cannot offer customization on the text. - Please use a computer to download the file, not your phone. - This file is for personal use only and cannot be reproduced or resold commercially. - I don't accept returns, exchanges, or cancellations. - Please contact me if you have any problems with your order.