If you are first-time user, it is recommended that you start by reading ‘How to play’ or watching the ‘For Beginner’ video. 

The goal of this app is to live as long as possible and to earn as much points as possible. You earn points by blowing away ghosts. You earn extra points if you manage to blow away ghosts at greater distance away from you. However you lose a life each time a ghost hits you. The game is over after you lose a total of three lives.

GhostFan lets your iPhone to simulate a fan! First you capture ghosts onto your iPhone screen with its camera. Then your finger presses the screen to activate the fan. 

Some key points: ghosts will appear anywhere around you, so it is important that you stand up, stretch your arms, and rotate your body in order to capture ghosts and blow them away! To help you find ghosts, use Radar on the top left corner of your iPhone screen.

You can also play in Relaxing Mode in which ghosts only come in front of you. However, you have to deal with more ghosts in this mode.

Source: http://itunes.apple.com/se/app/ghostfan/id427792813?mt=8