A method is provided for administering a game over a wireless telecommunications network (30) serving a number of mobile terminals (20). The wireless telecommunications network (30) includes a number of base stations (32) providing wireless communication coverage for corresponding geographically defined cells (34). The method includes: establishing a game offering in response to a triggering event; designating a region in response to the established game offering; locating mobile terminals (20) within the designated region; sending over the wireless telecommunications network (30), to mobile terminals (20) within the designated region, an invitation to participate in a game in accordance with the established game offering; and, collecting over the wireless telecommunications network (30), from mobile terminals (20) to which the invitation was sent, responses to the invitation, the responses indicating that the invitation to participate in the game has been accepted or declined.