Hey,
I have a topic that concerns two categories: Games and Emulator. I decided to write here: So I would like to play the classic Tetris game and need to add a new emulator for the first gameboy.
i tried to download a new core with retroarch, but i don’t know how it really works. Maybe someone could give me an short tutorial or a first step for a solution, please.
That would be great! Thanks 
ok for everybody who like to play classic gameboy games (gb) – like Tetris, Choplifteror or so on…
add the file extension to the action.config file:
home/cpi/apps/launcher/Menu/GameShell/20_Retro Games/MGBA
So this like this:
ROM=/home/cpi/games/MGBA
ROM_SO=/home/cpi/apps/emulators/mgba_libretro.so
EXT=gba,gbx,gb
LAUNCHER=retroarch -L
TITLE=MGBA Roms
SO_URL=http://buildbot.libretro.com/nightly/linux/armhf/latest/mgba_libretro.so.zip
But mgba on the GS is so slow…
I’d recommend gambatte for GB©
for all who have the same question use this awesome tutorial:
click here
Credits: @nouty - Thank you