Depends on the terms of use made by the provider(s). If their terms require a credit then do it. If you have bought the work outright (you own the rights) then you are cool. But read any terms that. Is essential.
@lycettebros I will go back and have a look at the terms and maybe email them if I am unsure. I only have three people I got sounds and music from two were paid and one was free. Would it matter if I just gave them all credit like "Music xyz by abc", "Clinking sound by def"?
Credit is irrelevant if the resources you are using aren't licensed for a particular media outlet. For example, some music that is sold is licensed for making movies and distributing them on the YouTube or in commercial projects, but isn't allowed in games. Some art assets that you may find and pay for are good for personal use projects, but not allowed for commercial ones, or limited to a certain number of uses. You may find an asset that it's Terms of Use state you cannot use the resources in mobile games or apps. It should all be spelled out for in the license agreement. If it isn't, or if you can't really follow the legal mumbo jumbo, it's advised to contact the content creator directly.
Some art assets that you may find and pay for are good for personal use projects, but not allowed for commercial ones, or limited to a certain number of uses. You may find an asset that it's Terms of Use state you cannot use the resources in mobile games or apps.
This is a tricky and dangerous detail which is often missed. Even the big expensive sources like Getty have this distinction and much higher license fees for usage in apps.
They usually further differentiate between background images and art that makes up key game elements.
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They usually further differentiate between background images and art that makes up key game elements.