Seamful Game, by Matthew Chalmers from the University of Glasgow (Scotland), is a GPS and WiFi based game played in the streets using PDAs.

To be successfull, two teams of runners must develop an understanding of the network coverage and the effect of signal strength. It thus turns the patchy network coverage, usually seen as a problem, into an important feature of the game.

Players travel around a designated area collecting digital “coins” (which appear all over the map, including in places not covered by the 802.11b wireless network) and uploading them to get points. To gain these points, players must upload the coin to the server, by pressing the “upload” button on their PDA in an area where there is 802.11b coverage. If players attempt to upload coins in an area not covered by WiFi, the upload fails and they loose all the coins they are carrying.

Only by understanding the boundaries of the network, and the effect of signal strength on their ability to upload coins, and thus score points, will players be successful in winning the game.

The “Pick Pocket” feature of the game allows a player to steal coins from other players nearby. The player has to be inside network coverage, and use the GPS to get within 10 meters of another player (also within network coverage). By pressing the “Pick Pocket” button, they can grab any coins the victim is carrying but has not uploaded yet.

Plus, scattered around the map are “Mines”. If a player moves to within 10 meters of a mine, it will detonate and the player’s PDA will be temporarily disabled.