Yes, there's a little bit of room to play with this. Thought people might like the example code. Especially with how i've implemented the act/gravity method. I've not commented the code because it should (hopefully) easy to read.

Great idea, although it wasn't initially clear what I had to do. Might be worth uploading a few instructions. I.E. Find the answer to match the question!

There's also a bug. If the ball lands to the side of a platform, it seems to go really mad (in terms of a quick repeated up/down motion and noise).

This is coming along lovely. Really could do with a menu at some point to restart the game etc. Rather than having to click restart/run.