This app is for citys entertainment. This app can be executed in front of the Seoul Railway Station, Seoul in Korea. This app can communicate with media facade name "seoulsquare", a kind of big urban screen in the seoul city. The user play a simple ball game and that result is send to the media facade and also get the feedback from the media facade. Like this , with this app user can enjoy game with Citys Big Screen. That would be fantastic experience to the app users.