Just hold your phone so that the home button side is close to your mouth and blow! There are three difficulty settings which alter how sensitive the microphone is, all scored separately on the servers!
To play this game, you will need an iPhone or 2nd gen iPod Touch (with an external microphone) which is running 3.0.
Have fun!
To see all of the high scores (there are LOTS), go to http://www.cocoslive.net/game-scores?gamename=Paper%20Planes
