A great project made for FOSS Greece.
The purpose is for users/players login to theirs' facebook accounts, and play the application so they can win many presents.
The system consist of 4 mobile phone, placed on small wheeled platforms. those platforms move about 5 cm when they receive a phone call. The more users called on the specific phone, this phone moves faster to the end, and all the players that call the specific phone that ended first can win great gifts. There was also live video feed of the race.
The game was on for about 2 weeks, with thousens player trying to score.
After all it was a big success with a lots of presents for the people who participate the game.