Nintendo has announced that Mario Kart 8 Deluxe is the best-selling game in the racing series.According to the publisher, the Nintendo Switch game has sold an additional 3.34 million units during the six months since September 30, 2021–as reported by VGC.Following the confirmation, Mario Kart 8 Deluxe has now officially sold a total of 38.74million units since its initial release in 2017, beating Mario Kart on the Wii which previously held the title of the best-selling game with 37.38million