The most common context for a "Mario Kart DS QR code" is the process of digitally installing the game onto a custom-firmware-enabled Nintendo 3DS or 2DS.
: Users with modded Nintendo 3DS systems often use the FBI application to install software via QR codes. mario kart ds qr code
Since QR codes aren’t native, your best bet is to look for or save editing communities that use QR as a convenience layer. Good starting points: The most common context for a "Mario Kart
If you are looking for actual in-game codes, Mario Kart DS has a hidden "Contest Code" feature. In the , press Up, Down, L, R, Y, A to generate a unique code. These were originally used for official Nintendo competitions in Japan to verify your race times. How to Create Code on Mario Kart Ds Good starting points: If you are looking for