If you like JoJo's Bizarre Adventure, specifically part 3, and you have a New Nintendo 3DS, this will be useful for you. If you don't have a modded 3DS, you'll need to
Super Mario Maker CIA QR Code for use with FBI : r/Roms
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Pokémon X CIA QR Code for use with FBI : r/Roms
RELEASE] Local CIA server with QR codes | GBAtemp.net - The Independent Video Game Community
how to install 3ds CIAs using qr codes with FBI - YouTube