In this section, we're going to build on everything we've covered so far, and learn how to make sprites that fall and bounce convincingly.

If you've skipped some of the previous sections, it's worth going back and doing them now as this section assumes you've got a pretty solid understanding of the story so far.

If you've skipped bits, you're going to find this section bewildering, and might reach the incorrect conclusion that Javascript is hard.

Javascript is easy if you understand one bit before moving on to the next.