Nintendo has the biggest update available for Mario Kart Tour players. Adding multiplayer to the game as of now. Players can compete in 8-player races. In addition, Nintendo is hosting a special retweet campaign. If the campaign reaches 15k players will get a Mario 8-bit badge, 20k unlocks 20 rubies, and 30k will net everyone 30 rubies. Mario Kart Tour is now available for mobile devices.