Scratch 2.0 Game Development Hotshot - I absolutely enjoyed this book from the first project to the last I felt the author did a wonderful job of relaying the information clearly to me, the approach was very well received and I enjoyed learning about Scratch which was very easy to use and I liked the logical flow of operations, while you're using their program/interface you are also learning how to develop a video game, if you pay close attention to the code blocks you'll start to pick up on the patters and repetition. This will certainly help you with muscle memory! This reminded me of drawing on the computer screen with a turtle way back in elementary school, it kept my attention and that counts for a lot.
I would like to mention as another reviewer stated, you cannot export the files but you can use an iFrame to share. While I find scratch to be quite amazing for learning the tedious events that happen while a game is played, I would recommend using a language like C++, C#, or C to get you going afterwards.