This game called cubic ninja allowed users to create and share levels. The way you would share the level is to save the level as a QR code. Then you could take a photo of the QR code with your 3DS camera. A specially created QR code took advantage of a flaw in the software to allow unrestricted code execution in 3DS mode! If your SD card is loaded with games and other homebrew softwares you are in business.
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http://www.polygon.com/2014/11/18/7244187/nintendo-3ds-exploit-homebrew-cubic-ninja
This game called cubic ninja allowed users to create and share levels. The way you would share the level is to save the level as a QR code. Then you could take a photo of the QR code with your 3DS camera. A specially created QR code took advantage of a flaw in the software to allow unrestricted code execution in 3DS mode! If your SD card is loaded with games and other homebrew softwares you are in business.
Good luck getting a copy of Cubic Ninja now.