When you purchase any amiibo figure at participating GameStop and Best Buy locations or Amazon.com, receive a free download code for early access to the Mini Mario & Friends amiibo Challenge for the Nintendo 3DS or Wii U. This promotional period is from March 25 through April 27, 2016.
The early access download code works for any 3DS console, given that you have an amiibo reader/writer, and for the Wii U, as this game is activated through amiibo functionality.
Mini Mario & Friends amiibo Challenge was previewed at the latest Nintendo Direct on March 3 and features new levels and obstacles to overcome. Specific amiibo figures will unlock Mini Toys with their own special abilities and exclusive level sets. Any amiibo figure can be tapped to guide the Mini through the level to the exit.
Mini Mario & Friends amiibo Challenge is expected to launch free for Wii U and 3DS via the Nintendo eShop on April 28.