A closed beta for the smartphone-based Mario Kart Tour was announced on the official website. The beta test will run from May 22 through June 4 and is limited to Android phones in Japan and the US.
Applications are available now and close on May 7. To sign up, users must apply on the game's website using an Android phone with a Nintendo Account that is linked to a Gmail account that is also linked to Google Play.
The test is limited and if the number of applications exceeds the maximum number of participants, users will be selected at random.
Link:
Mario Kart Tour website