Ho ho ho everyone,
Here is a cool project I'm about to finish.
It allows your Game Gear to play Nes, Snes, Gameboy, SMS, Megadrive, Sega CD, 32X or Playstation games.
More information on this page :
https://galix.fr/pages/projects/ggpie.php
Merry Xmas !!
PS: I won't sell it but I'll explain how to make your own