There are three holes that you have to get your marble in.
You have a teammate who has to do the same thing while both of you are trying to stop your opponents from getting in the hole too.
To better understand it you can read a report on it in Sports Illustrated.
Thats right I said Sports Illustrated. You can read it Here
Here is a picture of the indoor version called the Super Dome Here
He uses it like chalk on a pool cue.