Why do sounds need to be credited specifically? Why not images, models or music? Fonts?
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Because generally people make the images themselves, by drawing in some designing software or websites. Most music are licensed so if you use free music, you need to credit them. (I mentioned sound not only about sound effects, but anything which you can hear while the game is being played - so music is also counted in it) Coming to models and fonts, you have to credit them too.