I was 10 years old when I first got my SNES Mini for Christmas and I loved it as a kid but after playing it for 3 days I then realized something was missing.
and I knew what was missing on the mini. It was Super Mario All-Stars! a true SNES library wasn't complete without Mario All-Stars!
So I looked up on YouTube for a tutorial on how to mod a SNES Mini and my 10 year old self found out it was very easy to do!
Just plug the mini to your computer, Install Hakchi2 on your computer. Add any ROM you felt like to add in there,
flash the custom kernel with the new game and all done. Now I had Super Mario All-Stars on my collection, FUCK YEAH!

and during the following months I kept adding loads more SNES games to it including ironically adding in bad games like Lester the Unlikely and Shaq Fu.
I even learned how to add more than SNES roms like NES, Genesis, Master System, GBA, etc.
TL;DR: I modded my SNES mini when I was 10 so I could play Super Mario All Stars on it.