The newer updates always causes problems such as the hero start to acting strange and the grafics disappear ! The grafics show up and disappear like this again , again and again . The hero walk and run slower and the accurate of killing zombies become lesser than normal . There is no reason for this to happen except for the updates . I feel so bord and I can't complete the story . I uninstall it and I download it again , again and again . The problems are still happening . Uninstall it .