REXplorer
Rafael Ballagas, Sven Kratz, Jan Borchers, Eugen Yu, Steffen P. Walz, Claudia Fuhr, Ludger Hovestadt, Martin Tann · 2007
REXplorer is a mobile, pervasive spell-casting game designed for tourists of Regensburg, Germany. The game uses location sensing to create player encounters with spirits (historical figures) that are associated with historical buildings in an urban setting. A novel mobile interaction mechanism of "casting a spell" (making a gesture by waving a mobile phone through the air) allows the player to awaken and communicate with a spirit to continue playing the game. The game is designed to make learning history fun for young (and young at heart) tourists and influence their path through the city.