System name:
gamegear

Full system name:
Sega Game Gear

Supported file extensions:
.68k .68K .bin .BIN .bms .BMS .chd .CHD .col .COL .cue .CUE .gen .GEN .gg .GG .iso .ISO .m3u .M3U .md .MD .mdx .MDX .rom .ROM .sg .SG .sgd .SGD .smd .SMD .sms .SMS .7z .7Z .zip .ZIP

Launch command:
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\genesis_plus_gx_libretro.dll %ROM%

Alternative launch commands:
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\genesis_plus_gx_wide_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\gearsystem_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\smsplus_libretro.dll %ROM%
%EMULATOR_RETROARCH% -L %CORE_RETROARCH%\picodrive_libretro.dll %ROM%
%EMULATOR_MEDNAFEN% -force_module gg %ROM%
%EMULATOR_MESEN% --fullscreen %ROM%
%EMULATOR_ARES% --fullscreen --system "Game Gear" %ROM%

Platform (for scraping):
gamegear

Theme folder:
gamegear