That’s the Mega Mushroom from Mario Kart Wii at work here.
☆ NintendObs Weekly – Monday, September 30, 2019 – Sunday, October 6, 2019.
Directly to you from Twitter:
Source: Mario Kart Tour EN.
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…
…Wanna play? Buy a 3DS.
That being said, click on Mario Kart Tour for everything you need to know about the game. 😀