As I mentioned earlier, adding sounds and effects in SpriteKit is very simple. It is really one line of code that needs to be added to create the desired sound effect.

First, we will import all the files to the project. So, select all the .mp3 files in the folder you created earlier, and drag them into the project.

Make sure that you check Copy items if needed and your project is selected as the target.

Also, make sure that the files exist under Copy Bundle Resources in the Build Phases, as the files sometimes don't get copied, even after you select the project as the target. If the files don't exist here, then you will get a build error saying the said file can't be found, even though the file exits in the project hierarchy. In that case, click on the + button and add the files.