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If you mean a Friend Code, just go to the smiley face icon on the home screen and it tells you there. If you mean a QR code, while on the Mii Maker, go to image options (or something like that) and do save mii as QR code. hope this helps
A 3DS is Nintendo's latest handheld device (aside from the 3DS XL, a bigger 3DS) that boasts several capabilities over its predecessor, the DSi. These include the ability to make Miis, a redegisned home menu where you can change the dimensions and create menus, Streetpass, Spotpass, the Nintendo eShop, AR Card readers, QR code scanners, and of course, 3D.
QRZan is one of the most popular free online QR code generators. The high resolution of the QR codes and the powerful QR code campaign options make it one of the best QR code generators on the web that can be used for commercial and personal purposes.
it sais in the nintendo show 3d
QR code was created in 1994.
You need a QR code to unlock Metal Mario (like all of the color yoshis). So far Nintendo has not shown the USA code. But the Europe,Astraia,and Japan codes(if you are from one of thoses place just Google it). If you are from USA wait untill Nintendo releases the QR code. They most likely will in a couple of days.
Quick Response
A QR code (QR = Quick Response) is a two-dimensional barcode.
A QR Code generator free online is a web-based tool that allows you to create QR Codes without having to download any software. To use a QR Code generator free online, you first need to select the type of information you want to encode in the QR Code. This could be a website URL, contact information, or even a coupon code. Once you have selected the information, you need to enter it into the QR Code generator.
If I knew I would not be looking in here
A QR code (QR = Quick Response) is a two-dimensional barcode.
If using a smartphone to scan and read qr code symbols, a qr code reader app must be installed on the smartphone. There are a lot of such apps for both iOS and Android available. Smartphone uses the camera as the scanner to read the qr symbols. See the related link for a qr code library for creating qr code generator on Android.