Iphone hot when playing game?

I have been playing this iphone app call "Clash of Clans". But it makes my phone hot after a few mins. Is it bad for the phone? Will it spoil?

The iPhone and all other electronic devices heat up after a while

If its older then iphone 5 then you should be fine. Because I have an iphone 5 and it just gets a little warm wile playing.

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