They put the game automatically on your Wii U if you’ve allowed the feature for that.
☆ NintendObs Weekly – Monday, May 2, 2016 – Sunday, May 8, 2016.
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…
…Wanna play? Buy a Wii U.
And if you’ve already got yours, click on Mini Mario & Friends amiibo Challenge for everything you need to know about the game. 😀