This is a great book that brings robots to life. My mom downloaded the free app on the iPad that you need to use, I thought it was great that the app was free. There are 4 different things you can do with the book and app; build your own robot, fly a drone, battle with robots and interact with a life-size robot. To do each activity you have to hold your iPad or phone over a specific page in the book. I got one of my parents to do this bit, and we couldn't get it to work straight away. We found putting the book flat on the floor was best. The only downfalls were, sometimes when you were doing an activity the robots would disappear off the screen and you would have to start again, and also the battle the bots activity you need 2 phones or iPad's to do it, and I think it would have been better if you didn't need 2 devices to do that, and could battle the computer. I liked reading all the information in the book about robots, and learnt lots of new things. It is a really fun interactive book, and there are others you can get in the series.