In this game you are taken "home" were there is a randomly generated track with a ball sitting on it. There are little magenta colored balls scattered around the track as well. Every time you touch the screen at the right time the ball jumps to the next little platform and depending on it, picks up a magenta colored ball. If you reach a certain number of the little magenta balls you can buy different colored balls and tracks using the magenta balls. I love this game and find it very addicting. It is definitely worth getting. This is one of the best free apps I have ever had.