Harry Potter/Willy Wonka for kids who aren't old enough to read yet. If your kid loves poring over images in Look and Find books like the "I Spy series", they will likely get a lot out of Wizard and Co's busy and beautiful illustrations. There is also a secret message at the end that you can decipher if you pay close attention to all the pictures.
This could have been 5 stars, but the story wasn't very well done. I think it would have worked better as a puzzle book with a little bit of a story to it, rather than a storybook with a little bit of a puzzle to it.