Why doesn't my sound work on my iPhone 4?

Music and alarms go off but none of the game music comes out

One thing that it could be, you know the two little buttons on the left top, where you can adjust the sound, where right above that is a line you can push up and down. It will turn your sound off and you possibly might have moved it on accident. P.S. It is suppose to be in the up position. Good Luck Sorry I didn't see you say that your getting some sound. So this is probably not it.

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