When I download better game like Dungeon hunter 4, gun bros 2 etc.... I open game my iphone 5 loading game and then he back to menu screen and nothing more why this are on my new phone?
As when there is a problem with a 3rd party app on your computer, you need to contact the app developer regarding a problem with their app.
Any change after powering the iPhone off and on?
Then contact the app developer regarding a problem with their iPhone app.
try sign out and back in again in Settings > iTunes & App Stores > Apple ID: > Sign Out and sign in again.
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