Set of 3 books: ① Nostalgic Showa Era Spot the Difference ② "Adult Brain Training! Chiko-chan's Super Difficult Spot the Difference" From NHK's "Chiko-chan ni Shikarareru!" ①② Approximately one-third of the pages have pencil markings. ③ Dog Spot the Difference I believe almost all pages have pencil markings. I have not thoroughly inspected every page, so please refrain from purchasing if you are concerned about the condition. Will be sent via post. Cognitive Prevention Quiz