This time around, all players can participate.
☆ NintendObs Weekly – Monday, January 20, 2020 – Sunday, January 26, 2020.
01.23.20
The second multiplayer test is here and runs through 9:59 PM PT on 1/28/20!
This time around, all players can participate! You can even race against nearby Mario Kart Tour players using your device’s location data.
If you’ve been itching to test your skills against other racers, this is your chance! Race your friends by tapping Menu, and then Multiplayer in-game.
For a summary, notes, and other details regarding this test, please see the multiplayer test section of the official Mario Kart Tour website.
— Nintendo What’s New
Source: Nintendo.
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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. 😀