Right - well then.
First you need to find the music/sounds you want to use.
For game like this, you want happy music, so you look for happy background music on youtube.
https://www.youtube.com/results?search_query=happy+background+musicThen you look for sound effects - just type in 'points sound effect' and you'll get a bunch of results on youtube.
Then you want to convert the youtube sounds into mp3 format. This site does the trick, but there are many others -
https://www.onlinevideoconverter.com/ko/mp3-converterThen you want to insert the audio into your ppt - err... on my school computer, I only have the Korean version of PPT. It's under the sabib option.
Then you want to remove the unnecessary bits from the mp3 file - you left click on the inserted file and new options should become available in the top area of the PPT. You pick jeseng and there pick 'audio trimming'. Pick the start and end - the rest will be discarded.
Then you open the animation panel. There you pick where you want the sound file to go. In the example file I've just posted, I made the music file play from the beginning of the slide (again, you can clearly see this in the animation panel). The rest of the files and sound effects are also set to play from the beginning of the slide, but with delays. In other words, the first cupcake appearance/sound are set to appear/play 0.1 second after the music file starts playing. The next cupcake/sound effect are set to appear/play 1 second later, etc.
If you have any other questions, let me know.
Cherios.