I wanted to learn how to use Ghidra for reverse engineering binaries. The thing that allowed me to really improve with it was using it to analyze old video games that I played as a kid in the 1990s. Finding previously-unknown cheat codes, coming up with improvement patches, and figuring out how they work is very motivating!

I'm happy that these retro hardware projects are working out; I've liked seeing people test out what I've found in Ghidra on real systems.