All of the other exercises had a tutorial on actually doing the exercise. This one, Complex Obstacle Drop, doesn't have a play button. Are we just supposed to create the two animations and submit?
Yep.
Look at https://cgcookie.com/lesson/obstacle-drops-i and https://cgcookie.com/lesson/obstacle-drops-ii and then tackle this one.
You are free to make your own interpretation of this exercise but I would suggest that you don’t make it too hard for yourself.