[…]…This post will describe how I solved simple.gb, a Gameboy ROM challenge written by @condret. It was actually my first time reversing a Gameboy ROM — and it was awesome![…]
https://www.megabeets.net/a-journey-into-radare-2-part-1/
https://www.megabeets.net/reverse-engineering-a-gameboy-rom-with-radare2/