Camp Invention - Ball-Room Challenge

The Challenge:

How can you send a ball from one room into a room next to it without touching the ball after you place it into your invention?

Design a machine or gadget that will send a ball from one room to the next and into a cup.

Share your design with us and other inventors by uploading a picture of it to the Invent Now gallery. Let others know what it is by answering the questions below:

What did you first think of to build to carry the ball to the next room? Did your first ideas work the way you wanted them to? How did you change what you built?
What was the most difficult part of this challenge? Why?
What materials did you use? Why did you choose the materials you used? Did you change materials to make your machine work better? How did the new materials work?
How many tries did it take you to get the ball into the cup?