Play
A lot of people come to coding, or computing in general, as something they learn to help them with a task, or to form an idea, or to make a piece of software or hardware do exactly what they want it to do, and not some other person's idea of what to do. When you keep getting something that is almost, but not quite, tea, at a certain point there comes the desire to do it yourself. A lot of that initial spark is driving someone to learn, and if you can feed them lessons that will help them get the skills they need to realize whatever is in their head, you have a much better chance of getting them to stick with it to the end. Desire is a powerful motivator, and play is a great way of getting people to express and solve their desires. We'll come back to it at the end, but keep it in mind as we go through the other key words.