Microsoft's Xbox Live utilizes the Gamerscore to reward Achievers, who can get points by completing difficult "Achievements" in the various games they purchase.
The site features a number of tools to help game-players learn about what aspects of games they enjoy, including automated tracking of games on Xfire, Steam and Xbox Live; a database of games that locates games based on gameplay elements such as setting, tone and game mechanics; and quizzes such as the Bartle Test, which helps a player identify what aspects of game play they are most interested in—and then form connections with other players with similar interests.
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