How to add a downloaded game onto my iPhone 6?

So recently my friend downloaded a game for IOS and he sent it to me. At first I was like cool but then I realized that I had no idea what I was doing. Can somebody help? I just need to know how to put downloaded games onto my iPhone 6.

How did he send it to you? Cause you could just find it in the App Store/iTunes? Or just search the Internet for the game. I'm sorry if this isn't exactly what you were asking

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