Jailbreaking Super Mario World to Install a Hex Editor and Mod Loader [video]
youtube.com
youtube.com
The speaker live coded a hacking script for a NES emulator. He was showing off the Twilio API, which allowed the audience to text memory addresses and bytes to modify the games memory.
If you like this sort of stuff, reddit.com/r/speedrun can be fun to visit.
And if you have never watched speed runs, Summoning Salt has a fascinating series on world record progressions in popular games: https://youtu.be/RdAkY7RfajY
Reminds me of some similar stuff you can do with Pokemon Red and Blue, which let you hack the games and share your changes to other people through the link cable functionality: