Where you think you are, is not where you might end up playing this game! Guesstimate is a casual game that uitilizes algorithms typically used for GPS positioning and provides you a random exploration experience of your city.
Knowing about your distance to predefined locations around you allows you to compute your current position. Of course, this task gets more difficult by 
measurement errors. Guesstimate illustrates the impact of such errors by handing the job of delivering reliable distance measurements over to you: How far is it from your current position to e.g. Big Ben, Westminster Abbey or Tower Bridge? From your guesses, Guesstimate derives a geocoordinate where you would be, if your estimations were correct. Before the next round starts, you have to move to that place as a penalty – the better you guess, the less you walk…
Give it a try (just download the file on your Android device and tap once to install):
http://www.geogames-team.org/files/Guesstimate.apk
Got noone staging a game for you? Design your own gameboard with only a few taps on your mobile:
http://www.geogames-team.org/guesstimate/editor/
Thanks again to ESRI for making this possible.
