Nintendo is offering free Super Mario Bros. Deluxe 3DS downloads via its Join Nintendo Network Promotion.
The promotion is aimed at rewarding those who register or link a Nintendo Network ID on the handheld, a feature that was recently introduced via a December 10 system update.
Those who perform the registration process between December 10, 2013 and January 31, 2014, will receive a download code for the Game Boy Color title via e-mail.
Download codes will be sent between February 13 and February 28, 2014 to the email address registered to the owner's Nintendo Network ID, the company said.
Via the version 7.0.0-13U update, 3DS users can sign into existing Nintendo Network IDs and deposit and share digital currency through either the 3DS or Wii U.
Nintendo warned that, if users register the wrong Nintendo Network ID on their 3DS, they will be unable to combine balances with the Wii U.