This is an Augmented reality application which allow you to play paper piano you should draw a piano with fourteen white keys and ten black keys or download the paper piano template available in the app and print it tape the paper on a table under good lighting conditions then start the application and put your device on the table in a position in which that all the paper piano keys are visible in the camera touch the screen until you get a message telling you that the app detect the fourteen white keys and ten black keys finally press the paper piano keys and get the sounds from your mobile!
You can also play normal piano with this application and record your played note in MP3 or MIDI formats.

Note: If you have a small device you should put it on something to increase its height and get the right picture for the piano to detect all piano keys.