Rube Goldberg Machine #2

Wow! I can't believe it's already number 2! Here it is:

So here is how it works:

1)The marble pushes away the stick so the steel ball can move.
2)The steel ball knocks the tower down, making the stick fall and letting the ping pong ball go.
3)The ping pong ball knocks down the block which, via connected string, pulls down a stick so the second ping pong ball rolls down into a tube.
4)The tube rolls down a ramp to the bottom and stops.
5)The ball rolls out of the tube onto one last ramp.
Mission Complete!