The yellow board on the bottom is moving right and left. When you touch the screen, it will stop and change the moving direction. What you need to do is to hold the ball whenever the ball approaches the bottom.This is a casual game, you only need one thumb to play it. You can enjoy it when you are on the bus, subway or waiting in a line.It supports English, Chinese, French, Germany, Japanese, Korea, Portugal,Italian, Spanish, Russian.