Product Review

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All you need to do is own one physical game of the system you want to play off the SD card; just one cartridge will let you play all the games from that console. One physical cartridge for the Nintendo Entertainment System (NES), will allow you to play all the games on the SD card for the NES. The same rules apply for every other console.
Game Boy - Works with a Game Boy cartridge. Has four different folders for North America, Japanese, European, and 'Others' games.
Game Boy Color - Works with Game Boy Color cartridge. Has four different folders for North American, Japanese, European, and 'Others' games.
Game Boy Advance - Only works with Game Boy Advance cartridges. Four folders, North American, Europe, Japanese, and 'Other' games.
Famicom - Japanese 'NES' games. Works with NES or Famicom cartridge.
NES - Nintendo Entertainment System games. Works with NES or Famicom cartridge. Has five different folders for Classic NES, North American, Hacked, European, and 'Others' games.
SNES - Works with SNES and Super Famicom cartridges. Has three different folders for Clasic SNES, North American and European games. Also has a SNES Hack folder, BX-X Satellaview, and 'Other' games.
Super Famicom - Japanese 'SNES' games. Works with either SNES or Super Famicom game cartridge.
Game Gear - Needs the Retron 3-in-1 adapter to play, works with Game Gear cartridges. Has three different folders for North American, Japanese, and European games.
Genesis / Mega Drive - Works with Genesis / Mega Drive cartridges. Has four different folders for North American, Japanese, European games, and 'Others".
Master System - Needs the Retron 3-in-1 adapter to play, uses Master System cartridges. Has four different folders for North American, Japanese, European, and 'Others' games.
SG-1000 - Needs the 3-in-1 Retron adapter.