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How well will a "GTA like" sandbox (open world) cop game for iOS and Android sell?

• I'm in the process of developing a mobile game for iOS and Android. I have been working on it for 4 months but I don't anticipate being done for about another year.    I have several years of experience doing 3D animation. I am developing it in Unity, and it already is turing out better than most indie games on the market.    So far the animation and design is up to par (and superior in some places) to that of the GTA games on the app store already (GTA3, Vice City)    The game is a bit different than GTA too. In the game you have a variety of optional missions you can complete (Murder investigations, taking down a gang of drug dealers, etc.) that involves a bit more thinking. Then there are randomly generated small missions you can complete. (Gang fights, robberies, stolen cars, etc.).    The game also includes a point system that will allow the player to upgrade to different ranks to unlock better missions, weapons, vehicles, (even a helicopter!), etc.       I primarily wrote this to hear other peoples sales projections, but if you have any ideas for the app I defiantly want to hear them! The game is called iCop and will be available from late 2014 to early 2015. Thanks!

• Answer:

  I think it will sell pretty well . Seeing how the ios version of gta has fared and the cop alternative concept of la noire has fared , I believe it will sell well provided it is made well .