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1.)Improve rewards: I think most players finds castle clash boring because of its crappy rewards. With a better reward, the game can become exciting again.
2.)Gem rolling: The rolling system needs to be improved as thousands of gems were wasted on rolling the new hero but only a few players were lucky enough. With an improved rolling system, the players who left out of frustration from rolling would return definitely.
3.)Modify or add other game mode:Instead of releasing a new hero every month, a new game mode should be added or an already existing mode should be modified just as in "lost realm" which now have bosses to be fought.