Pretty cool read about designing a custom PCB for a GB Gameshark. Well, sort of. Just read it, it'll explain :B
EDIT: Oops, just realized this was also posted on Mastodon. I'll boost it too.
https://retroboogie64.com/2025/03/28/gameshark-sleeper/
#Nintendo | #Gameboy | #GB | #Gameshark | #RetroGaming