The Circuit Playground Express has my favourite thing on the board: shiny lights! The ability to control individual lights, to change them to any colour is the inspiration to a lot of my builds.
The Circuit Playground Express is featured in every mission except mission 6.
I had the pleasure of meeting Limor and her husband Phillip at the home of the Circuit Playground Express: Adafruit in New York. Adafruit works endlessly to bring electronics to the masses. Their website is full of helpful tutorials and a forum for further help. You can buy everything you need for this book there too!