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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 makedoi:10.1145/1240866.1240927 dblp:conf/chi/BallagasKBYWFHT07 fatcat:zvkxnp5qnbebfbd6mhwiwbimge