Wi-Fi on Genesis is actually a thing.
There is a variant of the NES cart for Genesis in the work (search for rainbow-net on github to get the technical documentation,) and there is a game named "1985 World Cup" with working Wi-Fi feature (with a specific cart just for that game I think.)
No platform-fighter yet though. I won't do it because maintaining one game already keeps me quite busy but I'd like to see it come to life too 🤩