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Since this is essentially a sticker book based on Monkey Puzzle (the story is not part of/woven into the activity book), kids who have read the book would enjoy it more than those who haven't. Otherwise, its a good buy and thanks to the variety and level of activities included (sticker, spot the difference, word search, counting exercise, and so on), a child can continue to enjoy the book as s/he grows older.
(Please note that reviews on the Monkey Puzzle Sticker Book page are for the Monkey Puzzle storybook, and therefore inapplicable to the actual product in question.)