It's a beta version, so you have to apply to be one of the "testers."

FINALLY! Get your red shells ready, folks. The beta version of Mario Kart Tour will be available for download for Android users starting on May 22nd in the US and Japan. Nintendo is taking American applications until June 4th, but you MUST sign up if you're interested in trying it out.

The full, final game will be available for all devices starting this summer but for now, if you're a Droid user, click HERE to apply to be one of the beta testers.