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  ====Applications for mobile devices====
  Several other reader's companion apps for mobile electronic devices have been published, generally without the endorsement of Martin or his publisher. They include ''Game of Thrones Companion'', similar in approach to the above-mentioned ''Guide'', and ''Westeros Map for Game of Thrones'', which contains maps of Essos and its cities. Other ''A Song of Ice and Fire''- or ''Game of Thrones''-themed apps include a trivia game, a study guide, and a weather app from HBO.