GPS Mission
This new scavenger hunt style game will get you some fun walking around in your environment and collect gold, answer riddles, find new places and share pictures with your friends. You can create easily missions for your Friends and every one else who is playing GPS Mission. Everything you need is a Symbian S60 Phone or Windows Mobile Phone with internal or external GPS and GPRS or G3 data connection. Itīs free except of your connection costs.
http://gpsmission.com/gps-mission/jsp/gps-mission/downloads_partner.jsp