Welcome to the simplest programming book in all the multiverses. In this book you'll learn how to program. Some people have accidentally learned how to program in Io at the same time. We take no responsibility for those incidents.
Through out this book you'll be introduced to the Io language and be building a Text Based Adventure. That's just a fancy word for "adventure computer game that uses text as the medium and the user has a large amount of control over what happens." Try saying it with your pinky raised and you'll sound pretty fancy.