'Mario Kart Tour' App Drops br on iOS and Android Devices.br Fans of Nintendo's mobile br racing game can play it on the br iPhone, iPad and iPod Touch.br Android devices also now carry 'Mario Kart Tour,' which br is free to play.br Purchases will be available within br the game that are used for upgrades.br You must also pay to unlock certain features.br Through online rankings, players of br 'Mario Kart' will be able to view br each other's results worldwide.br Every two weeks, Nintendo will also br cycle its "global tour" section br of the game.