Sky-High Sundae

Sky-High Sundae is a course set to be released as part of Wave 2 in the Booster Course Pass for Mario Kart 8 Deluxe and at a later date in Mario Kart Tour. It is the fourth and final course of the Propeller Cup in Mario Kart 8 Deluxe and is currently the only new course in the Booster Course Pass. It is set entirely in anti-gravity (the fourth course to have this trait after Mute City,, and Big Blue) in a large area (described as a city) made entirely of ice cream and other candy-related food high in the sky.

Its announcements for Mario Kart 8 Deluxe and Mario Kart Tour occurring during the same trailer makes this the first course in the series to be announced for two games simultaneously. Likewise, it is also the first new course to be announced for Mario Kart 8 Deluxe that isn't based on a Mario Kart Tour course.

Course layout
The track starts off inside of a giant freezer, after which the racers use Glide Ramps to fly either into or around a giant ice cream cone. Flying into the hole in the cone rewards players with Item Boxes. After that, they land on a chocolate-covered cake with a giant H on it, resembling a helipad. Upon landing, they begin travelling down a light-blue staircase, and at the bottom the path begins curving to the left while proceeding to go up a staircase. At both staircases, there are railings which split the players. After the upward staircase, the player begins to ascend a slope which splits off into two paths. At the top of those paths, they begin jumping down onto some platforms, which can be landed on both above and below. After the two paths join back together, a path made out of giant ice cream cones circles around an even larger piece of ice cream inside a cup. After turning around, the player jumps between three giant pieces of ice, which lead to a giant ice tray that leads back into the giant freezer where the Finish Line is.

During the race, various advertisements can be seen on giant waffle pieces. At the staircase segment, there are numerous ice cream shops to the right of the path. In the sky, a helicopter modeled after an ice cream cone can be seen, complimenting the helipad seen at the beginning.

Mario Kart Tour
Sky-High Sundae is confirmed to be coming to Mario Kart Tour in the future. It is currently unknown what tour the course will debut in, or if any changes will be made to the course. It is the first course to debut in Mario Kart 8 Deluxe to make an appearance in Mario Kart Tour.

Trivia

 * Following the release of the first wave of the Booster Course Pass, a datamine revealed a banner featuring numerous unreleased courses. Among the courses was [[Media:MK8D-Banner-Leak-SHS.png|an image of Sky-High Sundae]], four months before the course's official series debut.
 * Despite being the only new course added in the Booster Course Pass, it isn't the only course to lack a prefix in the pass, as Tour Ninja Hideaway also lacks a prefix.