I am on iOS8 Iphone 5s
Under settings- scroll to bottom and I have a list of all my apps. I can click on Dragon story and there is a button to turn off cellular data.
I have not seen this before, so I think this is new with the iOS8 version update.
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Yeah, I'm thinking this must be an iOS 8 thing too, I want to keep my system at iOS7 for at least a couple of months, I don't like new OS updates, they're always so glitchy and clanky. But it's good to know they added it, so that I can turn on cellular data to games that I want when I do update my system.