PinPang is a retro game in a suitcase.
To start playing first download and print out the marker found at:
http://www.andreasblick.com/koffa/pinpang.html
The marker has to be placed flat on a surface, e.g. a table. Make sure it is well illuminated. Pointing your iPad`s or iPhone`s camera at it, an antique suitcase appears in the same spot. Keep a distance of about a meter between the device and the marker.
To open the suitcase, touch one of its lock with two fingers or the two locks at the same time. The suitcase opens and an old screen and a control panel appear. You start playing by touching the button displaying the koffa logo, which will launch a ball on the screen.
To move the pad visible on the screen up and down, move the "mechanical" pad on the control panel inside of the suitcase from left to right.
Enjoy!