Foursquare
Foursquare is a location-based social networking game.
Foursquare is a location-based social networking game. Users Check-in at venues. They are then awarded points and sometimes badges or even become mayor:
We wanted to build something that not only helps you keep up with your friends, but exposes you to new things in and challenges you to explore cities in different ways.
Some more details in the initial announcement
The Layar version by Squio.nl is currently in early development.
Squio.nl is not affiliated with Foursquare.