One of the things that really peaked my interest was the intertwining of the real world with the game. The game uses the built in GPS of the phone to determine if you are actually in a particular airport. If you play the game in the airport it will provide a special souvenir item that then stays with the game. For example, if you play the game near the San Jose airport it will unlock the microchip (which can become a prohibited item in the game from now on). Ingenious!