(Rube Goldberg) Light up light it up light it up light it up press the button!?

So I’m done building 8 steps, so I thought to myself let’s see if I can add 1 more step so, I thought and thought and thought for a long time and had 2 ideas that can work. Before testing the first one I remembered something “‘no more machines in the project’ my mom said” so the first idea which was to use my sphero. The second idea worked, it was to tape something round, and give a little push to my Hot Wheels cart car. And the chain reaction will start. I know what your thinking, you talk about all this amazing stuff, then why don’t you put an active video of the machine? Because, at the last post  which is number 6, there will be one but on this one, there is the added version. (The post before this has a non active version, but not the full one. After the video I added the 9th step.)  (Video will be added full version, but non active)