The Booster Course Pass DLC is split into six different waves, with each containing two cups of four courses. The game garnered such success that Nintendo decided instead of making an original game for the Switch, they would simply continue to support Mario Kart 8 Deluxe with new content.
Mario Kart 8 Deluxe is the most successful Mario Kart game of all time, as well as the highest-selling Nintendo Switch ever, despite being a port of Mario Kart 8 on the Wii U.