Mario Tennis Open multiplayer detailed, QR codes for characters Nintendo has detailed the mltiplayer features and character unlocking system for Mario Tennis Open.

It's as simple as selecting the Scan QR Code option, lining up the square target on your 3DS screen with one of the QR Codes and seeing the corresponding Mii magically pop up on your screen.

We experience some Mario-themed multiplayer madness in this hands-on preview of New Super Mario Bros. Mii.