So Hackchi2 has been released allowing you to add more games to your SNES Classic! I'll include the download link to the HackChi file but you'll have to look for the game ROM's yourself. Just follow along with the video and you should have no problem expanding your SNES Classic's library.
Of course you do this at your own risk and accept any and all responsibility should you brick your SNES Classic.
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There's no need for a virus scan since the source code is posted on their Github.