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Human computation is a field that studies the employment of humans' computing ability to solve complex problems that computers cannot easily solve in time. Games present one plat form for human computation in an entertaining manner. Pioneered by Luis Von Ahn and his colleagues, many games "with a purpose (GWAP) systems have been developed in recent years, such as ESP, GWAP for the Semantic Web, and CityExplorer. Computational tasks, including image tagging, building the Semantic Web, and collecting geo spatial data for cities, are "crowd sourced" to the players and solved by human power.