What is a game where u set up levers and stuff and knock it down with a ball?

I don't know if there's a game but what is it call when u do that? Its hard to explain but u see it on tv sometimes where they make a big cool contraption with strings and levers and sometimes dominoes and they start it with a ball rolling and it's pretty cool. Just wondering if there's an app where u can make one or even what it's called. Thanks if u an help