Sonic Dash won't play on my iPhone 4s?

I downloaded this game 3 times and it still hasn't downloaded! All it does is show the SEGA logo then goes back to my home screen.
It looks like an interesting game to play so how can I fix the problem so I can?

Do you have iOS 7? If not, the recent updates have made it very difficult to play the game at all on earlier iOS.

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