Nintendo have announced an offer as part of their update to 3DS V7.0.0, if customers update to the latest firmware and either create a new Nintendo Network ID and link it to their 3DS console, or link an existing ID created on a Wii U to their 3DS, they will automatically be emailed a download code for the GameBoy Color game Super Mario Bros Deluxe. The ID has to be linked to a 3DS and the email address associated with it verified before 31st Jan 2014 for the offer to be valid.
Info here
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