These books are awesome! This was one of my son's first books that he couldn't put down. Our copy is completely worn out!You can change the colour of the car on each page by pulling the tab down which he absolutely loves. It really helped him to learn his colours. We also have Fishy Fishy where the number of fishes changes when you pull the tab.
I have just discovered a third pull the tab book in the series about dinosaurs so I've ordered that too.